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#2700972 - 06/29/15 10:15 AM Re: Feel free to ask Myles [Re: LoupGarou]
myles_rose Moderator Offline
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Registered: 11/28/01
Posts: 5033
Loc: Los Angeles CA, UNITED STATES
Originally Posted By: LoupGarou
Hi Myles,
Thanks for answers. No, I don't run the amp flat out these days, and rarely have in the past, so I don't think I'm taxing the amp in any way.

Could you describe the "crossover - notch" bias setting method?

Thanks,
Chris


That is best shown in real time as my thought on 1k or 400hz, where to set the volume control on the amp (I use 7 on most amps), input setting on the signal generator and what "just goes away" on the notch is personal observation.

Get a bias probe. It is more accurate and repeatable.

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GP Island
#2709039 - 07/28/15 10:06 AM Re: Feel free to ask Myles [Re: myles_rose]
Caevan O'Shite Online   content
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Registered: 04/05/02
Posts: 24315
Loc: The Great Spirit's Handprint o...
Hey again, Myles. cool

Is there any reason that I couldn't use a Radial Cabbone speaker-switcher connected to one cab to switch a Rivera RockCrusher Attenuator in and out of the path between amp and speaker?

That is, having a speaker-cable going from the Cabbone switcher to the speaker-cab from one output, and cable > RockCrusher Attenuator > speaker-cab from the other, perhaps via a parallel/mono Y-cable (speaker cable) connected to each of the Cabbone switcher's outputs...

I'd really like to have the attenuator switched-in when switching to the second 'overdrive/distortion/gain' channel of an amp...

Thanks once again! cool
_________________________
Ask yourself- What Would Ren and Stimpy Do?

~ Caevan James-Michael Miller-O'Shite ~
_ ___ _ Leprechaun, Esquire _ ___ _

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#2709043 - 07/28/15 10:28 AM Re: Feel free to ask Myles [Re: Caevan O'Shite]
myles_rose Moderator Offline
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Registered: 11/28/01
Posts: 5033
Loc: Los Angeles CA, UNITED STATES
AS long as the amp always sees a load you are fine.

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#2709045 - 07/28/15 10:34 AM Re: Feel free to ask Myles [Re: myles_rose]
Caevan O'Shite Online   content
20k Club

Registered: 04/05/02
Posts: 24315
Loc: The Great Spirit's Handprint o...
Originally Posted By: myles_rose
AS long as the amp always sees a load you are fine.


Thanks, Myles! cool twothumbs rawk
_________________________
Ask yourself- What Would Ren and Stimpy Do?

~ Caevan James-Michael Miller-O'Shite ~
_ ___ _ Leprechaun, Esquire _ ___ _

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#2725149 - 10/01/15 11:09 PM Re: Feel free to ask Myles [Re: Caevan O'Shite]
Caevan O'Shite Online   content
20k Club

Registered: 04/05/02
Posts: 24315
Loc: The Great Spirit's Handprint o...
Say, Myles-

what are your thoughts on the Egnater Rebel 30 MKII head, which, among other things, uses a pair of 6V6's AND a pair of EL84's, which can be used separately or blended together?
_________________________
Ask yourself- What Would Ren and Stimpy Do?

~ Caevan James-Michael Miller-O'Shite ~
_ ___ _ Leprechaun, Esquire _ ___ _

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#2725665 - 10/05/15 08:26 AM Re: Feel free to ask Myles [Re: Caevan O'Shite]
myles_rose Moderator Offline
MP Hall of Fame Member

Registered: 11/28/01
Posts: 5033
Loc: Los Angeles CA, UNITED STATES
Originally Posted By: Caevan O'Shite
Say, Myles-

what are your thoughts on the Egnater Rebel 30 MKII head, which, among other things, uses a pair of 6V6's AND a pair of EL84's, which can be used separately or blended together?


Personally, I love anything Bruce Egnater has ever done. The designs are terrific and they are very cost effective. As a side note, if you ever want a crash course in amp building / amp repair / amp training, go to one of his seminars. Even if you have to fly across the country and even forgetting that you end up with a door prize .... a great amp that you built yourself in the class .... you still get one heck of an education without going home with student loans to pay off.

Bruce Egnater = great stuff = great designs = a great guy too.

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#2730054 - 10/23/15 12:46 PM Re: Feel free to ask Myles [Re: myles_rose]
Lokair Offline
Gold Member

Registered: 04/12/08
Posts: 591
Loc: Braeburn PA
Hello Myles
I would like to ask your advice on re-tubing My mesa quad preamp?
its from 1991 and the original tubes are still in there. Mesa recommended 12spax for 6 spots and just 12ax7 s for 2 (V14 and V24 positions) of them. I want to retain the tone in amp 1, but amp 2 could be a little darker. Just fresh tubes may be the answer but thought i would check.

Next question I use a tube works provalve (BK butler) for a power amp with this rig. Can you make a suggestion for 6l6gc replacement tubes to give it bit more head room.


Thanks for your time.
Lok
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Out of work Musician,Camera Operator,Mechanical Tech, Electronic Tech. So what...

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#2732164 - 11/03/15 09:01 AM Re: Feel free to ask Myles [Re: Lokair]
Lokair Offline
Gold Member

Registered: 04/12/08
Posts: 591
Loc: Braeburn PA
Please skip this inquiry as I sold the quad that this is in reference too. The one I still own has good tubes, I guess I got everything mixed up when I sold some gear, and switched my whole guitar/bass rig around. I still own the provalve and will be updating the tubes in it eventually, but for now I am using a mesa 20/20 (on loan).

Sorry for the question that leads to no where.

Lok
_________________________
Out of work Musician,Camera Operator,Mechanical Tech, Electronic Tech. So what...

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#2732342 - 11/04/15 09:05 AM Re: Feel free to ask Myles [Re: Lokair]
Larryz Offline
MP Hall of Fame Member

Registered: 06/23/08
Posts: 9360
Loc: Northern California
Hi Myles, one of my buddies has an amp question. He has a Mesa Boogie Lone Star head and wants to hook it up to his Rivera K212 B6 speaker cab. The amp has an 8ohm and two 4ohm output jacks. The speaker has two input jacks and the jack plate shows Stereo Z 8 and Mono Z 4.

His question is which way to hook up the amp and cab in order to get the best tone while being safe? Should he run from the 2 4ohm outputs on the amp to the two inputs on the cab? or, should he run from the 8ohm output on the amp to a splitter and then plug in to the 2 inputs on the cab?

Thanks for any help you can provide! Larryz

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#2732347 - 11/04/15 09:16 AM Re: Feel free to ask Myles [Re: Larryz]
myles_rose Moderator Offline
MP Hall of Fame Member

Registered: 11/28/01
Posts: 5033
Loc: Los Angeles CA, UNITED STATES
Measure the impedance at the amp end of the speaker cord using various combinations, noting which is at about 3.4 and which is around 7.2 ohms on a DVM. If below 7 ohms use the 4 ohm mesa jack and if above 7 ohms use the 8 ohm jack. The Rivera cabs can be a bit confusing so I always recommend using a ohm meter to assure that things are really as they are expected.

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#2732376 - 11/04/15 11:20 AM Re: Feel free to ask Myles [Re: Larryz]
Caevan O'Shite Online   content
20k Club

Registered: 04/05/02
Posts: 24315
Loc: The Great Spirit's Handprint o...
Originally Posted By: Larryz
Hi Myles, one of my buddies has an amp question. He has a Mesa Boogie Lone Star head and wants to hook it up to his Rivera K212 B6 speaker cab. The amp has an 8ohm and two 4ohm output jacks. The speaker has two input jacks and the jack plate shows Stereo Z 8 and Mono Z 4.

His question is which way to hook up the amp and cab in order to get the best tone while being safe? Should he run from the 2 4ohm outputs on the amp to the two inputs on the cab? or, should he run from the 8ohm output on the amp to a splitter and then plug in to the 2 inputs on the cab?
Originally Posted By: myles_rose
Measure the impedance at the amp end of the speaker cord using various combinations, noting which is at about 3.4 and which is around 7.2 ohms on a DVM. If below 7 ohms use the 4 ohm mesa jack and if above 7 ohms use the 8 ohm jack. The Rivera cabs can be a bit confusing so I always recommend using a ohm meter to assure that things are really as they are expected.


Do I understand correctly, that this Rivera speaker-cab must have two 8 ohm speakers wired in parallel to a TS plug for 4 ohms at the "Mono Z 4" jack, and individually wired to Left and Right TRS plug at the "Stereo Z 8" jack?
_________________________
Ask yourself- What Would Ren and Stimpy Do?

~ Caevan James-Michael Miller-O'Shite ~
_ ___ _ Leprechaun, Esquire _ ___ _

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#2732516 - 11/04/15 10:55 PM Re: Feel free to ask Myles [Re: Caevan O'Shite]
Larryz Offline
MP Hall of Fame Member

Registered: 06/23/08
Posts: 9360
Loc: Northern California
Thanks Myles, I'll pass that info on with regard to the amp out and the cab.

Not sure how it's wired or if it uses a TRS Caevan, as he could not locate a manual for the cab. A Rivera salesman responded to an email suggesting he use the mono side...but, I think he should take a peek under the hood first as the amp manual shows all of the compatible speaker combos...

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#2732902 - 11/06/15 09:23 AM Re: Feel free to ask Myles [Re: Larryz]
myles_rose Moderator Offline
MP Hall of Fame Member

Registered: 11/28/01
Posts: 5033
Loc: Los Angeles CA, UNITED STATES
It's easier just to measure the cab and know the actual operation. If you don't have a DVM you can buy one for less tha $10 at any electronics store or online at Amazon. Everybody should have one lying around.

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#2732976 - 11/06/15 05:53 PM Re: Feel free to ask Myles [Re: myles_rose]
Larryz Offline
MP Hall of Fame Member

Registered: 06/23/08
Posts: 9360
Loc: Northern California
Thanks Myles! I have a DVM. Hopefully my buddy will have one as well. thu

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#2733061 - 11/07/15 08:49 AM Re: Feel free to ask Myles [Re: Larryz]
myles_rose Moderator Offline
MP Hall of Fame Member

Registered: 11/28/01
Posts: 5033
Loc: Los Angeles CA, UNITED STATES
Very good.

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#2736993 - 11/25/15 09:29 AM Re: Feel free to ask Myles [Re: myles_rose]
Caevan O'Shite Online   content
20k Club

Registered: 04/05/02
Posts: 24315
Loc: The Great Spirit's Handprint o...
Happy Thanksgiving, Myles! To you, yours, and the many I'm sure that you touch.
_________________________
Ask yourself- What Would Ren and Stimpy Do?

~ Caevan James-Michael Miller-O'Shite ~
_ ___ _ Leprechaun, Esquire _ ___ _

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#2737037 - 11/25/15 11:11 AM Re: Feel free to ask Myles [Re: Caevan O'Shite]
myles_rose Moderator Offline
MP Hall of Fame Member

Registered: 11/28/01
Posts: 5033
Loc: Los Angeles CA, UNITED STATES
Thank you very much. Happy holiday season back to you and yours wink

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#2741039 - 12/14/15 12:52 PM Re: Feel free to ask Myles [Re: myles_rose]
davidm Offline
Senior Member

Registered: 08/30/06
Posts: 45
Myles,

Is it safe to have the bias set at 37mA for a Quiana Reverb Studio? I switched techs for my last set up and he set it to 37mA instead of keeping it at 35mA where it usually is set to. It seems to have lost some sponginess in both channels. Is that a symptom of being over-biased? I'm thinking of having him reset it. Please let me know.

Thanks,

Dave

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#2741214 - 12/15/15 02:52 PM Re: Feel free to ask Myles [Re: davidm]
myles_rose Moderator Offline
MP Hall of Fame Member

Registered: 11/28/01
Posts: 5033
Loc: Los Angeles CA, UNITED STATES
Dave,

This is totally fine. You are still well within spec and if you prefer the tone that is the main criteria.

Actually, the amp would technically be considered under biased compared to 35mA as it is running a bit hotter.



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#2741326 - 12/16/15 09:57 AM Re: Feel free to ask Myles [Re: myles_rose]
davidm Offline
Senior Member

Registered: 08/30/06
Posts: 45
Myles,

I'm going to have my tech set to back to 35mA. I really do notice a difference in feel and tone with the 2mA increase, which surprises me. I believe you recommended 35mA for this amp in a previous conversation I had with you.

Thanks for your help,

Dave

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#2741392 - 12/16/15 04:02 PM Re: Feel free to ask Myles [Re: davidm]
myles_rose Moderator Offline
MP Hall of Fame Member

Registered: 11/28/01
Posts: 5033
Loc: Los Angeles CA, UNITED STATES
2mA means almost nothing. If it sounds better, keep it at 37mA.

If you send me your plate voltage (measured), I will figure again.

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#2741544 - 12/17/15 12:29 PM Re: Feel free to ask Myles [Re: myles_rose]
davidm Offline
Senior Member

Registered: 08/30/06
Posts: 45
Myles,

It turns out my tech was testing my amp through a 16 ohm cab and forgot to switch it back to 8 ohms. I played through it three times that way at low volume settings and noticed a pretty big difference in feel and tone from what I was used to.

1) Could this have damaged the amp? I haven't picked it up yet since I took it back to him.

2) He thinks the speaker ohm setting probably accounted for the change in feel and tone I noticed. Do you agree?

3) Do you recommend biasing Quianas at 35mA?

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#2760439 - 03/02/16 12:58 AM Re: Feel free to ask Myles [Re: davidm]
skipclone 1 Offline
MP Hall of Fame Member

Registered: 08/21/03
Posts: 7835
Loc: Japan
Greetings Myles
This is my first question in ages-I have a VHT Valvulator, which is basically a line buffer-the manufacturer recommends a Sovtek 12AX7WB as the proper tube, but I just got my second replacement tube and, somewhere along the line-I don`t know if it`s my fault for grabbing the wrong tube off the shelf (previously) or the music store guy needs glasses (the new one), but they called and told me my 12AX7WA tube had arrived. I thought, uh oh. I looked on the receipt and sure enough, the guy wrote 12AX7WA. I saw a chart which shows about a 10% loss of gain with the WA and it is not the best choice for an amp-but is it a problem for the VHT? I have a recording session in two days so I`m not going to go back to the store at this point.
_________________________
Same old surprises, brand new cliches-

Skipsounds on Soundclick:
www.soundclick.com/bands/pagemusic.cfm?bandid=602491

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#2760510 - 03/02/16 08:40 AM Re: Feel free to ask Myles [Re: davidm]
myles_rose Moderator Offline
MP Hall of Fame Member

Registered: 11/28/01
Posts: 5033
Loc: Los Angeles CA, UNITED STATES
Originally Posted By: davidm
Myles,

It turns out my tech was testing my amp through a 16 ohm cab and forgot to switch it back to 8 ohms. I played through it three times that way at low volume settings and noticed a pretty big difference in feel and tone from what I was used to.

1) Could this have damaged the amp? I haven't picked it up yet since I took it back to him.

2) He thinks the speaker ohm setting probably accounted for the change in feel and tone I noticed. Do you agree?

3) Do you recommend biasing Quianas at 35mA?


Rivera stuff have stout transformers. I would guess there is not an issue. 35mA is fine but if you send me the actual B+ I will send you a 10% range.

There really should have been not much of a perceptible level change in volume when going from 8 to 16 ohms using the same cab. If there is, then I'd investigate further with your amp tech or ask him explain why.

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#2760512 - 03/02/16 08:41 AM Re: Feel free to ask Myles [Re: skipclone 1]
myles_rose Moderator Offline
MP Hall of Fame Member

Registered: 11/28/01
Posts: 5033
Loc: Los Angeles CA, UNITED STATES
Originally Posted By: skipclone 1
Greetings Myles
This is my first question in ages-I have a VHT Valvulator, which is basically a line buffer-the manufacturer recommends a Sovtek 12AX7WB as the proper tube, but I just got my second replacement tube and, somewhere along the line-I don`t know if it`s my fault for grabbing the wrong tube off the shelf (previously) or the music store guy needs glasses (the new one), but they called and told me my 12AX7WA tube had arrived. I thought, uh oh. I looked on the receipt and sure enough, the guy wrote 12AX7WA. I saw a chart which shows about a 10% loss of gain with the WA and it is not the best choice for an amp-but is it a problem for the VHT? I have a recording session in two days so I`m not going to go back to the store at this point.


There is no right or wrong, it is all personal preference. Both the WA and WB are cheap, low gain, but sturdy tubes. If it were my unit I'd go NOS and used a tube that meets spec rather than one that surely is not even close.

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#2760829 - 03/03/16 12:53 AM Re: Feel free to ask Myles [Re: myles_rose]
skipclone 1 Offline
MP Hall of Fame Member

Registered: 08/21/03
Posts: 7835
Loc: Japan
Originally Posted By: myles_rose
Originally Posted By: skipclone 1
Greetings Myles
This is my first question in ages-I have a VHT Valvulator, which is basically a line buffer-the manufacturer recommends a Sovtek 12AX7WB as the proper tube, but I just got my second replacement tube and, somewhere along the line-I don`t know if it`s my fault for grabbing the wrong tube off the shelf (previously) or the music store guy needs glasses (the new one), but they called and told me my 12AX7WA tube had arrived. I thought, uh oh. I looked on the receipt and sure enough, the guy wrote 12AX7WA. I saw a chart which shows about a 10% loss of gain with the WA and it is not the best choice for an amp-but is it a problem for the VHT? I have a recording session in two days so I`m not going to go back to the store at this point.


There is no right or wrong, it is all personal preference. Both the WA and WB are cheap, low gain, but sturdy tubes. If it were my unit I'd go NOS and used a tube that meets spec rather than one that surely is not even close.


Kool-so aside from manufacturer`s recommendation-and keeping in mind it`s not an amp-how would you determine the best choice? unfortunately the unit has been discontinued-I don`t know if there`s enough tech information available to brave the NOS waters.
BTW thanks for the reply.
_________________________
Same old surprises, brand new cliches-

Skipsounds on Soundclick:
www.soundclick.com/bands/pagemusic.cfm?bandid=602491

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#2761309 - 03/04/16 08:41 AM Re: Feel free to ask Myles [Re: skipclone 1]
myles_rose Moderator Offline
MP Hall of Fame Member

Registered: 11/28/01
Posts: 5033
Loc: Los Angeles CA, UNITED STATES
Originally Posted By: skipclone 1
Originally Posted By: myles_rose
Originally Posted By: skipclone 1
Greetings Myles
This is my first question in ages-I have a VHT Valvulator, which is basically a line buffer-the manufacturer recommends a Sovtek 12AX7WB as the proper tube, but I just got my second replacement tube and, somewhere along the line-I don`t know if it`s my fault for grabbing the wrong tube off the shelf (previously) or the music store guy needs glasses (the new one), but they called and told me my 12AX7WA tube had arrived. I thought, uh oh. I looked on the receipt and sure enough, the guy wrote 12AX7WA. I saw a chart which shows about a 10% loss of gain with the WA and it is not the best choice for an amp-but is it a problem for the VHT? I have a recording session in two days so I`m not going to go back to the store at this point.


There is no right or wrong, it is all personal preference. Both the WA and WB are cheap, low gain, but sturdy tubes. If it were my unit I'd go NOS and used a tube that meets spec rather than one that surely is not even close.


Kool-so aside from manufacturer`s recommendation-and keeping in mind it`s not an amp-how would you determine the best choice? unfortunately the unit has been discontinued-I don`t know if there`s enough tech information available to brave the NOS waters.
BTW thanks for the reply.


All 12AX7s are interchangeable. If you need NOS assistance, a great guy is Mike at www.kcanostubes.com

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#2761325 - 03/04/16 09:29 AM Re: Feel free to ask Myles [Re: myles_rose]
Caevan O'Shite Online   content
20k Club

Registered: 04/05/02
Posts: 24315
Loc: The Great Spirit's Handprint o...
Originally Posted By: skipclone 1
Kool-so aside from manufacturer`s recommendation-and keeping in mind it`s not an amp-how would you determine the best choice? unfortunately the unit has been discontinued-I don`t know if there`s enough tech information available to brave the NOS waters.
BTW thanks for the reply.


Originally Posted By: Myles Rose
All 12AX7s are interchangeable. If you need NOS assistance, a great guy is Mike at www.kcanostubes.com


I'll chime in and say that I bought a sweet New Old Stock '60s Tesla EL34 from KCA NOS and Mike was indeed very helpful throughout and after the sale. cool twothumbs
_________________________
Ask yourself- What Would Ren and Stimpy Do?

~ Caevan James-Michael Miller-O'Shite ~
_ ___ _ Leprechaun, Esquire _ ___ _

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#2761636 - 03/05/16 08:58 AM Re: Feel free to ask Myles [Re: Caevan O'Shite]
myles_rose Moderator Offline
MP Hall of Fame Member

Registered: 11/28/01
Posts: 5033
Loc: Los Angeles CA, UNITED STATES
Originally Posted By: Caevan O'Shite
Originally Posted By: skipclone 1
Kool-so aside from manufacturer`s recommendation-and keeping in mind it`s not an amp-how would you determine the best choice? unfortunately the unit has been discontinued-I don`t know if there`s enough tech information available to brave the NOS waters.
BTW thanks for the reply.


Originally Posted By: Myles Rose
All 12AX7s are interchangeable. If you need NOS assistance, a great guy is Mike at www.kcanostubes.com


I'll chime in and say that I bought a sweet New Old Stock '60s Tesla EL34 from KCA NOS and Mike was indeed very helpful throughout and after the sale. cool twothumbs


Mike is the best in the business.

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#2764541 - 03/14/16 10:43 PM Re: Feel free to ask Myles [Re: myles_rose]
kanak333 Offline
Member

Registered: 03/14/16
Posts: 2
Loc: India
I am glad that you helped us. Thanks a lot for sharing such a nice information and clearing doubts.

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