Hi folks,

I'm a newbie with tube audio. When I put my ST-70 together I used Svetlana
(CED) power tubes and Sovtek 7199 driver tubes. The Russian 7199 tubes are
half the price of NOS and I had a couple in my tube box.

Do the 7199's have an effect on the sound of the amp? If so I'll have to
ring up one of the tube vendors at alt.guitar.amps and get some new ones.
Thanks much.

John
--
" I've got the same one, and it hums like a Lewinsky. "
Unknown Amp Tech

John,

Some of the old 7199s are microphonic. I'm under the impression that the
stock 7199s may not age gracefully sometimes . . . . I have no experience
with newer 7199s.

However, I have modded a number of ST-70s and my favorite is the Welbourne
Labs approach. Ned Carlson of Triode Electronics also has a kit . . .
Both of these mods obviate the need for the venerable 7199.

Jon

From: "John Templeton"
Organization: Cogeco Cable
Newsgroups: rec.audio.tubes
Date: Fri, 24 Oct 2003 11:31:07 -0400
Subject: ST-70 driver tubes

Hi folks,

I'm a newbie with tube audio. When I put my ST-70 together I used Svetlana
(CED) power tubes and Sovtek 7199 driver tubes. The Russian 7199 tubes are
half the price of NOS and I had a couple in my tube box.

Do the 7199's have an effect on the sound of the amp? If so I'll have to
ring up one of the tube vendors at alt.guitar.amps and get some new ones.
Thanks much.

John
--
" I've got the same one, and it hums like a Lewinsky. "
Unknown Amp Tech

Yes, the NOS 7199 sound quite a bit more open than the Sovtek. In the SCA35
the Sovtek just would not work.

John Templeton wrote:

Hi folks,

I'm a newbie with tube audio. When I put my ST-70 together I used Svetlana
(CED) power tubes and Sovtek 7199 driver tubes. The Russian 7199 tubes are
half the price of NOS and I had a couple in my tube box.

Do the 7199's have an effect on the sound of the amp? If so I'll have to
ring up one of the tube vendors at alt.guitar.amps and get some new ones.
Thanks much.

John
--
" I've got the same one, and it hums like a Lewinsky. "
Unknown Amp Tech

doctorjohn wrote:
Yes, the NOS 7199 sound quite a bit more open than the Sovtek. In the SCA35
the Sovtek just would not work.

[...]

Eh??? Why would they "not work"?

Cheers,
Fred
--
+--------------------------------------------+
| Music: http://www3.telus.net/dogstarmusic/ |
| Projects, Vacuum Tubes & other stuff: |
| http://www.dogstar.dantimax.dk |
+--------------------------------------------+

"Fred Nachbaur" schreef in bericht
news:B8kmb.1601$zx2.103@edtnps84...


doctorjohn wrote:
Yes, the NOS 7199 sound quite a bit more open than the Sovtek. In the
SCA35
the Sovtek just would not work.

[...]

Eh??? Why would they "not work"?



It's always hard to read a doctors handwriting .....
I think he wanted to say that they don't sound right ;-))




Cheers,
Fred
--
+--------------------------------------------+
| Music: http://www3.telus.net/dogstarmusic/ |
| Projects, Vacuum Tubes & other stuff: |
| http://www.dogstar.dantimax.dk |
+--------------------------------------------+

Fred Nachbaur wrote in message news:B8kmb.1601$zx2.103@edtnps84...
doctorjohn wrote:
Yes, the NOS 7199 sound quite a bit more open than the Sovtek. In the SCA35
the Sovtek just would not work.

[...]

Eh??? Why would they "not work"?

Cheers,
Fred

i have new Sovtek in an SCA35 and i'm happy with the sound...

"Tubetwang" wrote in message
om...
Fred Nachbaur wrote in message
news:B8kmb.1601$zx2.103@edtnps84...
doctorjohn wrote:
Yes, the NOS 7199 sound quite a bit more open than the Sovtek. In the
SCA35
the Sovtek just would not work.

[...]

Eh??? Why would they "not work"?

Cheers,
Fred

i have new Sovtek in an SCA35 and i'm happy with the sound...

Thanks alot everyone. Sounds like the camp is split on this one. I'll stay
with the Sovtek's until I get the bread for the NOS. After that I'll know
for sure.

Regards,

John

I don't know, I have RCA 7199's in my ST-70 and they sound noisy. I
guess it could be worse?

(mozilla) wrote in message . com...
My experience is that RCA 7199 blackplates sound best, followed by Sylvanias.

The Sylvanias sound way better than the Sovteks.


"John Templeton" wrote in message
...

"Tubetwang" wrote in message
om...
Fred Nachbaur wrote in message
news:B8kmb.1601$zx2.103@edtnps84...
doctorjohn wrote:
Yes, the NOS 7199 sound quite a bit more open than the Sovtek. In
the
SCA35
the Sovtek just would not work.

[...]

Eh??? Why would they "not work"?

Cheers,
Fred

i have new Sovtek in an SCA35 and i'm happy with the sound...

Thanks alot everyone. Sounds like the camp is split on this one. I'll stay
with the Sovtek's until I get the bread for the NOS. After that I'll know
for sure.

Regards,

John

On Sat, 25 Oct 2003 01:15:13 +0000, Fred Nachbaur wrote:



doctorjohn wrote:
Yes, the NOS 7199 sound quite a bit more open than the Sovtek. In the SCA35
the Sovtek just would not work.

[...]

Eh??? Why would they "not work"?

Cheers,
Fred

I've put them in SCA35's before, and in some cases
you'd get a "zipping" sound until the amp warmed up.
IIRC some of the earlier ones just sat there
and oscillated. Best can figure is that this was
due to the way the wires were arranged in the base
of the tube to make it pin compatible with 7199.
Seems they've straightened that problem out.

--
Ned Carlson Triode Electronics Chicago,IL USA
www.triodeelectronics.com

"Ned Carlson" wrote in message ...
On Sat, 25 Oct 2003 01:15:13 +0000, Fred Nachbaur wrote:



doctorjohn wrote:
Yes, the NOS 7199 sound quite a bit more open than the Sovtek. In the SCA35
the Sovtek just would not work.

[...]

Eh??? Why would they "not work"?

Cheers,
Fred

I've put them in SCA35's before, and in some cases
you'd get a "zipping" sound until the amp warmed up.
IIRC some of the earlier ones just sat there
and oscillated. Best can figure is that this was
due to the way the wires were arranged in the base
of the tube to make it pin compatible with 7199.
Seems they've straightened that problem out.

Funny you said that.
I get the same "zipping" sound in a SCA35 on warm up.
I always though it was due to the new JJ electrolytics or something...
Thanks.

doctorjohn wrote:
Yes, the NOS 7199 sound quite a bit more open than the Sovtek. In the SCA35
the Sovtek just would not work.

I have a pair of Sovtek's in my ST-70. No problems with sound
whatsoever. The only time I got burned with tubes was with my pre-amp.
Using Sovtek 12AX7WB's. When I stop and think, it comes through
the amp. I have never seen tubes as noisy as these.