any opinions on 6SJ7?
Enter your username
I understand that the driver tube on an SE amp is most important to the
final sound. My output tube is a 300B in a modified Western Electric model
91 (from the first issue of Sound Practices).
Could I do better than a 6SJ7? (yes, the system does sound pretty good, but
could it be improved with a different driver).
TIA.
Kurt Christie
Vernon H. Brown
I use a 7119 in SRPP configuration. 750ohm cathode resistors 365V on
the top plate and about 10mA current. It sounds very good to me but
there is not a lot of gain with this drive setup so it requires a quiet
preamp with good gain.
Regards,
Sandy Brown
Paul
The 6J7 has lower distortion, and this is why Hewlett-Packard used it in
their audio oscilator long after grid caps went out of style. The 1620
is a
low noise version of the 6J7 that might be even better. Also, an EF86
might
work with a different socket
Ned Carlson wrote:
> "Enter your username" <user...@in.on.ca> wrote:
>
> >Could I do better than a 6SJ7? (yes, the system does sound pretty
> good, but
> >could it be improved with a different driver).
>
> You could try installing a grid cap,rewiring the socket,
> and installing 6J7 or EF37A. Neither are expensive.
> WE-348A would be even neater, but cost big bucks.
>
> Ned Carlson, Triode Electronics, Chicago, IL http://www.triodeel.com
> Open 12:30-8 PM CT, 12:30-5 PM CT Sat Closed Wed
> ph:773-871-7459 fax 773-871-7938 "where da tubes are"
> Email catalogs: email our CataBot: cat...@triodeel.com
Chenchen Ku
Ned Carlson wrote:
>
> "Enter your username" <user...@in.on.ca> wrote:
>
> >Could I do better than a 6SJ7? (yes, the system does sound pretty good, but
> >could it be improved with a different driver).
>
> You could try installing a grid cap,rewiring the socket,
> and installing 6J7 or EF37A. Neither are expensive.
> WE-348A would be even neater, but cost big bucks.
Hi, Ned
I tried the ITT EF37A I bought from you in your ST-70 mod, sounds good,
do you have Mullard EF37 for sale? just want to try a different brand,
thanks.
By the way, when I put EF37 in the place of EF86 I didn't change and
resistor value and it seems it works okay, I only check the voltages
between EF86 plate and the driver tube cathod, I didn't spent time to
study EF37 data but it seems EF37 is quite similar to EF86, is that
correct?
Chenchen
Ned Carlson
"Enter your username" <user...@in.on.ca> wrote:
>Could I do better than a 6SJ7? (yes, the system does sound pretty good, but
>could it be improved with a different driver).
You could try installing a grid cap,rewiring the socket,
and installing 6J7 or EF37A. Neither are expensive.
WE-348A would be even neater, but cost big bucks.
Arnold Goksøyr
In article Chenchen Ku <chen...@aimnet.com> writes:
>By the way, when I put EF37 in the place of EF86 I didn't change and
>resistor value and it seems it works okay, I only check the voltages
>between EF86 plate and the driver tube cathod, I didn't spent time to
>study EF37 data but it seems EF37 is quite similar to EF86, is that
>correct?
>Chenchen
The EF 37 is an excellent valve, but look for the EF 37A. This is a low noise
version of this valve and its predecessor EF 36. EF 37A was used in the
preamp to the famous Williamson amplifier.
As far as I know, EF 40 and EF 86 is electrically the same valve. The only
difference is the socket. EF 40 was probably developed from EF 37A and became
EF 86 when it got the noval 9-pin socket. The Rimlock 8-pin socket on the
EF 40 was not were successful.
Plenty of both EF 37A and EF 40 in stock.
Best regards,
Arnold Goksøyr
DEMOSTENES A. Goksøyr
N5850 Balestrand
NORWAY
Phone +47 5769 1340
Fax +47 5769 1267
e-mail arn...@axp1.vestdata.no
Tubes, sockets, transformers and books.
Many nice things to find at my homepage:
http://www.vestdata.no/~arnoldg/valves.htm
Ned Carlson
Paul <ho...@supernet.ab.ca> wrote:
>The 6J7 has lower distortion, and this is why Hewlett-Packard used it in
>
>their audio oscilator long after grid caps went out of style.
Oddly enough, my HP-330A HD analyzer has 6SJ7's in it..
go figure...
Ned Carlson
Chenchen Ku <chen...@aimnet.com> wrote:
>Hi, Ned
>
>I tried the ITT EF37A I bought from you in your ST-70 mod,
Now how'd you manage to get an EF37A into a 9 pin socket?
> sounds good,
>do you have Mullard EF37 for sale? just want to try a different brand,
>thanks.
No, not at the moment..they're availble, but not a big seller,
so I'm kinda reluctant to stock up..at any rate the only difference
I can discern between Mullard & ITT British EF37A is the
metallizing on the outside of the ITT's are grey, the
Mullards are red. I'd bet they were both made by MO Valve, too.
>
>By the way, when I put EF37 in the place of EF86 I didn't change and
>resistor value and it seems it works okay, I only check the voltages
>between EF86 plate and the driver tube cathod, I didn't spent time to
>study EF37 data but it seems EF37 is quite similar to EF86, is that
>correct?
I don't have a lot of data on EF37A, but the filament current
is 150 ma vs 200 for the EF86.
Arnold says EF40 is the same as EF86 (but a different base),
but where you're gonna get 9 pin loktal sockets I have no clue.
8 pin loktals I have...
Chenchen Ku
>Ned Carlson wrote:
> >
> >I tried the ITT EF37A I bought from you in your ST-70 mod,
>
> Now how'd you manage to get an EF37A into a 9 pin socket?
>
I have some 9 pin tube base and I use the base and a octal socket
to make a octal-to-9pin converter, I do this all the time, I've
tried 6SJ7, EF804 (need 9pin-9pin converter) in the EF86 and
5687, 6SN7, 7119 in the driver tube (12AU7).
Chenchen