[AMRadio] 6CA7/EL34 replacements


Ken Zuercher hepcatrevival at yahoo.com
Sat Dec 8 12:19:56 EST 2007


I've had good luck with J J (tesla) tubes for output
tubes, EL34 and EL84. I've had good luck with Sovtek
preamp 12AX7s but not 6L6s. I use NOS that I have
collected from various sources, especially hamfests.
The Electro Harmonix 6L6s seem to be fine, I think
that they are picked out Sovteks and the Groove Tubes
6L6s though expensive work well. I think that they are
tested Sino or that they are making their own tubes
now.
There are new Gold Lion and Mullards now as someone is
using their designs or even the original tooling. Some
are reasonable in cost, some are only for audiofools
with more money than sense.The Mullards are supposed
to be good and not overpriced. i haven't tried them as
I have some NOS units at home. Output tubes last for a
few years with regular use, preamp tubes last me for
many (10+) years with regular use.
Ken Zuercher KC8QO

--- jeremy-ca <km1h at jeremy.mv.com> wrote:

> My son uses a Koch guitar amp with Ruby EL-34B-STR
> tubes and they dont hold 
> up well, another one shorted last week.
> 
> What are the preferred brands? Searching the web
> gives a lot of conflicting 
> info.
> 
> Carl
> KM1H
> 
> 
> ----- Original Message ----- 
> From: "Ken Zuercher" <hepcatrevival at yahoo.com>
> To: "Discussion of AM Radio in the Amateur Service" 
> <amradio at mailman.qth.net>
> Sent: Friday, December 07, 2007 12:39 AM
> Subject: Re: [AMRadio] 6CA7/EL34 replacements
> 
> 
> >I agree about the guitar shop. The Marshall amps
> use
> > EL34 tubes and are pretty tough on them (like me,
> I'm
> > a guitar player) I like the JJ tubes as they were
> the
> > Tesla brand and are made in the Czech Republic.
> They
> > also have a model with beautiful blue glass
> envelope.
> > Ken KC8QO
> > --- Mike Sawyer <w3slk at hughes.net> wrote:
> >
> >> John,
> >>     If you are in a hurry, try checking out your
> >> local guitar shop. I'll lay
> >> odds that they have them available for about the
> >> same price you get for mail
> >> order.
> >> Mod-U-Lator,
> >> Mike(y)
> >> W3SLK
> >> ----- Original Message ----- 
> >> From: "John King" <k5pgw at yahoo.com>
> >> To: <amradio at mailman.qth.net>
> >> Sent: Thursday, December 06, 2007 4:08 PM
> >> Subject: [AMRadio] 6CA7/EL34 replacements
> >>
> >>
> >> Please disregard my earlier post requesting
> >> information about substituting other numbered
> tubes
> >> for the 6CA7 for testing purposes.
> >>
> >> I got the transmitter working with the "old"
> >> 6CA7/EL34
> >> tubes. Now to order some!! Has anyone had much
> luck
> >> with the cheaper import 6CA7 tubes such  those
> sold
> >> by
> >> Antique Radio Supply under the brand names of JJ
> >> Electronics and Valve Art ???
> >>
> >> Thanks for reading. 73, John, K5PGW
> >>
> >>
> >>
> >>
> >
>
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