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miroslav

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About miroslav

  • Birthday 11/30/1999

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    Cosmic Cowboy

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  1. Yeah...I tried a 5751 in my 5E3 Tweed amp...and I like it the most...more than a 12AT7 or 12AX7. So now I have a couple dozen 5751 tubes and I will be trying them in my other amps. (It's just that they are not not cheap $$ compared to the 12Axx family.) Myles I know you've parted ways with Groove Tubes...but I was wondering if you could point me in the right direction. I have some GT Electronics tube mics that utilize the miniature 5840 tube (I'm told some GT mics came with the 6502 - same difference). Anyway...I was curious about the life-span of those tubes in these microphone applications with mild/medium use. IOW...should I expect to have to ever replace these tubes?
  2. Follow up questions... Given a 4-8-16 ohm selectable output amp...will there be any tone and/or performance quality differences between those outputs when using a 4 ohm, 8 ohm, or 16 ohm speaker with its respective output of the amp. 4-to-4 8-to-8 16-to-16 In other words...does the amp sound/perform exactly the same with each of those matched combinations? And...with a multiple output amp (4-8-16 ohm)...is there one output choice that would be considered "best" when taking into account the overall design of that amp? Thanks!
  3. Hi Myles Im trying to get some clarity on the multi-tap/multi-impedance amps and the best load to use. This discussion came up on another forumand someone said that even though an amp is meant for 8 ohmsusing a 16 ohm load will give better tone/performance...he said someone told him it was cuz the windings of the output tranny get cooking more...??? My understanding has always been that amps are designed for a specific best fit/best choice loadand while other loads may work fine with the ampit is the best fit/best choice load that will give you the best performance from said amp. And even with multi-tap ampsonly one of the taps would be a best fit/best choice when taking account of the overall design of the ampbut the other taps are still quite useable. Any substance to that Myles? That an amp meant for an 8 ohm load will sound/perform better with a 16 ohm load? Thanks!
  4. Hi Myles Trying to get a clear answer on the 7581A tube type.... Is it a KT66 or a 6L6? I know KT66 and 6L6 are same family...but this would be specifically for a Dr. Z Route 66 amp, which as I understand can NOT take 6L6 tubes...they have to be true KT66 tubes. I see a lot of different tube sellers use the "7581A" nomenclature for either KT66 tubes or 6L6 tubes...and I just want to be sure I'm getting tubes that will work in my Dr. Z Route 66. Thanks!
  5. Yes...I've checked out the Dr.Z Forum....some good stuff there. But where can I find the reams that you've written about the 66 amp...? Is it just on the Dr.Z fourm board...or is it located on your website...or is it elswhere...? Thanks!
  6. Hi Myles I just picked up a Dr.Z Route 66 amp, and was wondering if you had any preferences on the tubes to use for the 66. I am especially curious about the EF86. I see some on the Internet, but it doesnt appear like there are many different brands to pick from. Right now I am looking at a pair of IEC/Mullard EF86 tubes, but was wondering if there was any modern production of this tube you would recommend? Also...any tips on optimum setup for this amp...the bias/mA "best choice"...etc...and any other comments you might have about the Route 66. Thanks!
  7. Yes... I tried out several power tubes while leaving the front end tubes the same... ...and I only noticed subtle tone differences between the differnet power tubes...until I really push hard on the amp. But...changing out V1...boy!...it was amazing how one 12AX7 differed from another...causing huge tonal changes in the amp. Some good quality 12AX7's actually sounded like shit...so the brand isn't the whole story...nor the specs. It's like trying cookies...they all look good in the box...but some taste better than others!
  8. Shawners A point of reference from my own experiences. Just recently I purchased one of the new Traynor combo amps w/extension cab. It came stock with Sovteks...(3) 12AX7's in the front end, and a pair of 5881WXT's for power. The amp sounded fine...but I wanted a bit more harmonic definition and a meatier, chunkier tone. I decided to try some different tubes. So far...I've tried out a few brands in the preamp section...Sylvania/GE/RCA/Raytheon...all good NOS tubes. And I've tired out a few brands in the power slots...Tung-Sol/Philco/Philips/RCA black plates. You know what...some sound good...and some suck! I've spent a few hundred dollars, and right now, I have a couple dozen 12AX7/AU7/AY7 and another dozen of 6L6/5881 tubes...each one has a different flavor, and some I may not ever use again...because I have others that I like better... and, I will be getting some more tubes, just to see how THEY sound in my amp. There is NOTHING wrong with any of the tubes I have...they all check out and spec out just fine...BUT...there is a big difference in how they sound. So...don't expect any "good sound" guarantees just because you buy a new set of tubes! You have to try 'em out...and if they sound like shit...then you try some different ones. If the tubes are truly bad/faulty...then return them for substitutes. But I don't see that there is anyone here that is to blame for anything...it's just experimentationtrying to get the tone that YOU like...that someone else might hate. Move forward with it...don't dwell on it and get all worked up about ityoull find a nice tube combinationjust might take a few tries.
  9. You guys may already have this link bookmarked... ...but I found this site while google-ing for tube data. TUBE DATA I don't know how accurate his data is (maybe Myles can comment)...but he has a decent searchable database and it also cross-references tubes in the same family. Just click on the TUBE DATA button on his main pageand then you can search out characteristics of various tubes.
  10. Odd question about 6L6/5881 tubes. I have a bunch of 'em now... Pair of Philips JAN 6L6WGB - '70 Pair of Sovtek 5881WXT - '02 2 pair of RCA 6L6GB - '59 Pair of Tung-SOl 6L6GB - '58 Pair of Philco 6L6GB - '57 So here's the odd thing I just realized... the 2 RCA and Philco 6L6GB have 7 pins, with a pin at position 1, and only position 6 is empty... ...whereas the others (6L6WGB/5881), including the Tung-Sol 6L6GB have the usual 6 pins with no pins at positions 1 & 6. OK...what's with the extra pin at #1...??? I've already tired them in my amp...and all work fine, regardless of pin count. Is there something different with the RCA and Philco GBs....and then why do the Tung-Sol GBs have just 6 pins...??? Just one of those...DUH???...moments.
  11. OK...I kinda' understood that to be the best-case situation... Thing is...as I mentioned...I noticed that a given tube when placed in one position (V1) was more microphonic than when placing same tube in the V2 position. I was asking if position, along with the actual tube makeup, worked together to give more/less microphonics? Also...is it posible to anticipate a potentially microphonic tube by it's readings, and the balance between the two sides of the triode... ...or is that not relevent at all? I guess it's sometimes puzzling that you have some good quality tubes that read very well... ...and then you stick them in one position and tap...and notice the high microphinics...??? So is that it...just the ol' tap-test, regardlessf their other quality? Also...you specifically say no preamp tube should be microphinc...but, what about the power tubes....'cuz I notice that they too can exibit microphonics. Also...I've heard a lot of folks state that almost all tubes can have some degree of microphinics... ...and I must agree, since all the ones I tried out....more or less, when tapped...will ring...but only some seem to be heard at all during actual playing. Do those silicone/rubber O-rings/dampers help at all with those tubes that show very marginal microphinics? Thanks!
  12. Well...I tried some of those NOS 12AX7's in my other Traynor Amp (YCV40WR) in the V1 and V2 positions. Thought they do exibit some microphonics when I tap on them...they also sound real nice compared to the stock Sovteks (also had some microphonics) that were in there. I have another dozen NOS Sylvania/GE to try out...but the amp already sounds way better! I also got four RCA black plate 6L6GB's, clear top, double-D bottom getters...used, but still quite strong, and they sound excellent... ...again, way better than the stock Sovtek 5881's. I also tried some JAN Philips 6L6WGB's...and they are nice...but with a bit "harder" mids. So...what I am seeing is that even though some of the tubes exibit microphonics...they still put out great tones. Therefore, I would say that there needs to be some tube resonance....as it gives it it's tone/character...yes? I think I'll get some of those O-ring dampers and that should help out.
  13. Myles...Questions on tube microphonics: Just bought a bunch of 12AX7's along with some 6BQ5 tubes. As a quick check, I'm trying them out in A Traynor Mark III...but not all the new ones at once. There are (5) 12AX7's in the Mark III...and the easiest access ones, are positions V4 & V6...and positioq V5 is the 6BQ5 for the Reverb. The V4 & V6 tubes, I beleive are part of the Reverb cicuit...from the way I'm reading the schematic. OK...so I pulled V4, V5, V6...and inserted two NOS 12AX7's and one NOS 6BQ5...and then I power up and check the tubes. I'm finding some of the tubes are a bit microphonic...some more, some less...including the 6BQ5's in the V5 socket. I've also reversed the V4 & V6 tubes...and if the one in V4 was very microphonic...it became considerably quieter when placed in V6. So...is the best way to find the best socket for each tube...to just to keep swapping them around...or do you find that most microphonic tubes will pretty much stay that way regardless where they go...??? If the two sides of the triode are not equally balanced...will that increase microphonics? Appart from using dampers and what not...I'm just wondering if there are some better, worse ways to try and find the best positions for microphonic tubes...rahter than just toss 'em. Any tips/ideas are welcome.
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