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Sovtek 6bq5 500 volt , Russian military tubes, not USA type.

Posted: Sun Jun 29, 2014 9:25 pm
by angelod307
So I learned something, this may be common knowledge , but this was this first I heard of this so I pass it on.




Hello, I think the plates are a little thicker so it doesn't red plate (glow in the wrong areas) as easily as a regular 6BQ5,
and maybe its redesigned with slightly bigger spacing. The vent holes are different, and it has 2 getters instead of just one.
The military (EL84M) ones are designed for 10,000 instead of 3,000 hours. But that's when used conservatively.
USA 6BQ5s were rated for 300 volts max, but Dynaco Voxx Scott and guitar amps often run them around 420 volts.
I know 2 people that have VOXX 6BQ5 amps, and they only get about 50 hours out of new 6BQ5s, because regular 6BQ5s run so close to glowing.
I've restored hundreds of vintage amps, and even with new coupling caps, vintage 6BQ5s run very close to glowing dull red (which wears them out very quickly). If your amp is 14 watts/pair of 6BQ5/EL84, you probably can get by with regular 6BQ5s. If your amp is rated for 20 watts/pair, I'd use these.
The extra getters make them last longer. Thanks, Joe

- gobble75

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Mon Jun 30, 2014 9:24 am
by Zoot Horn
I have had very good performance with them Angelo,, no red plates with these puppies. I like the sound of the nos American tubes,, they just did not last too long,,this was before Harry did the Zener tweak.

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Mon Jun 30, 2014 11:24 am
by Chauss
Angelo,
The original tubes that came with the "kit" were not really doing the amp justice. I eventually had one of them red plate and did some investigating on the EL84 tubes (new to me at the time, as I am still a young fellow... that was the generation before me that did the "tube stuff"- :lol: ).

Currently I am running the russian tubes Mark posted a while back. sound pretty nice-good detail, air, etc (just a little noisy at dead silence, but meh...still great sound) nice orange glow, no red plating. Also running the soviet 6ax7's setup on mine (as originally designed by the BobFather) I think they are nick-named Red Rockets"?
Had the re-issue Mullard EL84/6bq5's in for 2 yrs previous with no issues, they work well also for a reasonable price (4 matched tubes @ 75 bucks).
Research the plate voltages on the mfg's specific tubes. The soviet and the re-issue Mullards are both capable of sustained higher voltages at the plate- that seemed to make the diff for me. Cheers!~

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Mon Jun 30, 2014 11:49 am
by radioeng2
Chauss wrote: ....nice orange glow, no red plating. Also running the soviet 6ax7's setup on mine (as originally designed by the BobFather) I think they are nick-named Red Rockets"?
Red Rockets! That's funny.

Have you noticed Martin's avatar? Now that, that's a red rocket!! ](*,) Notice the exposed OT...has to have been at CF during the build.

Mark

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Tue Jul 01, 2014 8:15 am
by Chauss
Mark-
Maybe the original tubes at the fest were "red rockets"? At least some of them were....I SAW it! :lol:

Angelo- a word of caution on some of the so called equivalent 7189's This is from Brent Jesse's website: (may be the 7189a's?)
The 7189 is an "industrial" version of the 6BQ5. It can handle 400 volts on the screen and plate, but otherwise looks just like a 6BQ5. Usually you can use a 7189 in place of a 6BQ5, but NOT the other way around! The 7189A has even higher ratings, at 440 volts, and has a different pinout. The pinout difference may make this tube incompatible with 6BQ5/EL84 circuits, unless you know it will work!

edit: added link---> http://www.audiotubes.com/6bq5.htm

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Tue Jul 01, 2014 11:15 am
by MRHP
Here is a little more info on the 6BQ5. You have your standard EL84's and then there is the E84L....there is a difference in that the E84L or sometimes called the 7320 will handle 450 volts at the plate. The Baby Blacks put out 405v so the E84L is nice and safe to run on the BB.

The Siemens labled RTC E84L's Im running and recommending are the the good ones like mentioned above.

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Tue Jul 01, 2014 11:29 am
by Snoop65
MRHP wrote:Here is a little more info on the 6BQ5. You have your standard EL84's and then there is the E84L....there is a difference in that the E84L or sometimes called the 7320 will handle 450 volts at the plate. The Baby Blacks put out 405v so the E84L is nice and safe to run on the BB.

The Siemens labled RTC E84L's Im running and recommending are the the good ones like mentioned above.
I'm very happy with the Siemens!!!! Thanks Eric!!!! :D

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Tue Jul 01, 2014 11:32 am
by Zoot Horn
You boys are running this expensive Ass tubes,, old working man like myself can only afford the Sovteks.

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Tue Jul 01, 2014 12:31 pm
by Snoop65
Zoot Horn wrote:You boys are running this expensive Ass tubes,, old working man like myself can only afford the Sovteks.
I got mine $150 for a set of four plus $9 shipping. I don't think that's too bad.

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Tue Jul 01, 2014 12:42 pm
by Zoot Horn
Nope,, not bad at all,,just more than I can spend,lol,,enjoy them!

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Tue Jul 01, 2014 2:19 pm
by Chauss
Hey snoop- save em for me as hand me downs in your quest for the perfect tube! :D

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Tue Jul 01, 2014 3:00 pm
by Zoot Horn
Throw some my way too!

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Tue Jul 01, 2014 4:14 pm
by Snoop65
Zoot Horn wrote:Throw some my way too!
I always share with friends and Dan too! :lol: :lol: :lol:

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Tue Jul 01, 2014 4:34 pm
by trav0810
I have tried various different EL84 variants and my favorite was an inexpensive set of Russian 6P14P-EV's that came form the Reflektor factory (that was purchased by Sovtek). Powerful and clean, with AMAZING bass. Bought the quad for around $40 shipped.

Re: Sovtek 6bq5 500 volt , Russian military tubes, not USA t

Posted: Tue Jul 01, 2014 5:59 pm
by Zoot Horn
trav0810 wrote:I have tried various different EL84 variants and my favorite was an inexpensive set of Russian 6P14P-EV's that came form the Reflektor factory (that was purchased by Sovtek). Powerful and clean, with AMAZING bass. Bought the quad for around $40 shipped.

Link please sir