From postmaste–(at)–riodeel.com Sat Sep 19 15:35:57 CDT 1998
Article: 127736 of alt.guitar.amps
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From: postmaste–(at)–riodeel.com (Ned Carlson)
Newsgroups: alt.guitar.amps
Subject: Re: Sovtek EL34s rattle prone/how ’bout gz34 rectifiers too?
Date: 18 Sep 1998 23:42:02 -0500
Organization: Triode Electronics
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On Fri, 18 Sep 1998 20:58:11 GMT, Marc Ferguson
wrote:
>You’re not the only one with the Chineeze GZ34 problem. Multiply # of tubes X .4 =
># of sparkomatics. Good light show in da combo! Ned’s got the real deal.
>Mullards. EOS. NOS.
Not many, and not cheap, tho.
Note that GZ34 take a long time to wear out..they’ll
outlast the power tubes by a long time, normally.
Don’t toss them just ’cause they’re old, used or both.
If you’ve got a worn out GZ34, you can hear it,
lack of headroom, breaks up too early, lack of power.
It’s even easier with a meter: with normal bias, if the
GZ34’s shot, the voltages will be way low.
Same goes for other rectifier tubes…while there’s
no great shortage of 5U4 & 5Y3, since there’s
a finite supply, might as well hang onto good
used ones.
One rectifier tube that draws about the same
filament current as 5AR4 but has a load o’ sag,
but can handle the current is 5R4
(GY/GYA/GYB/WGB..same thing in different bottles),
which can usually be had pretty cheap, since there’s
not much stuff out there that uses them.
5R4-WGA & WGB look like little weird flower
vases, and they’re aviation rated to 40,000 feet,
so you can brag to your friends that you’ve
got “B-52 tubes” in your amp. Just the thing
to have if you get a gig at the USO on Diego Garcia.
Ned Carlson Triode Electronics “where da tubes are!”
2225 W Roscoe Chicago, IL, 60618 USA
ph 773-871-7459 fax 773-871-7938
12:30 to 8 PM CT, (1830-0200 UTC) 12:30-5 Sat, Closed Wed & Sun
http://www.triodeel.com
Your Start Page for Tube and Tube Amp info on the net…
http://www.triodeel.com/tlinks.htm
