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Best 12BY7A?

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Randy Cook

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Sep 29, 1999, 3:00:00 AM9/29/99
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Any comments on the best one or mil spec equivalent for audio front end?

Thanks

OvrReactor

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Sep 30, 1999, 3:00:00 AM9/30/99
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I thought 12BY7's were RF tubes. What audio stuff can these be used in?

Regards,
Tom Mitchell

Helmut Usbeck

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Sep 30, 1999, 3:00:00 AM9/30/99
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Randy Cook wrote:
>
> Any comments on the best one or mil spec equivalent for audio front end?
>
> Thanks

Hi Randy,
The 12AY7 is a low hum, less microphonic, version of a 12AT7 designed
for audio use. I use them in the front end of a low power amp I built.
Ive been only able to get a hold of GE's. Sonicly I like them a bit
better than 12AT7.
Regards,
Helm.

Stewart Ono

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Sep 30, 1999, 3:00:00 AM9/30/99
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12BY7's are used in the front end of a Citation II, I believe.

Stu

Vince Rhea

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Sep 30, 1999, 3:00:00 AM9/30/99
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The Cit V for sure. I use them in mine. Haven't experimented that much with
them. Been to busy playing with SE!
Vince


Stewart Ono wrote in message ...

mcgui...@my-deja.com

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Sep 30, 1999, 3:00:00 AM9/30/99
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In article <7sui0o$5...@chronicle.concentric.net>,

"Randy Cook" <rc...@concentric.net> wrote:
> Any comments on the best one or mil spec equivalent for audio front
end?
>
> Thanks
>

Yep The CII uses them=) I'd say it depends on the use on what tube is
best. I believe the RCA's are considered best. The older style works
better for a amplification stage(my CII) and I use newer RCA's for the
splitter tubes.

Michael


Sent via Deja.com http://www.deja.com/
Before you buy.

Richard Matthews

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Sep 30, 1999, 3:00:00 AM9/30/99
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The 12BY7A is an excellent audio tube. Look at the curves (page 419 of RC30)
it has to be one of the most linear pentodes around. The Citation II does in
fact use it for the front end, and the driver/spliter.

Almost any major brand of 12BY7A is good. I have owned HK Citation II's
three times in my life and I wouldn't hesitate to use GE, RCA or Sylvania.

Richard
Leeds Electronics
http://www.leedselect.com
----------
In article <VOGI3.13475$q8.4...@newscene.newscene.com>, "Vince Rhea"

Robert Schneider

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Sep 30, 1999, 3:00:00 AM9/30/99
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On 29 Sep 1999 19:30:48 PDT, "Randy Cook" <rc...@concentric.net>
wrote:

>Any comments on the best one or mil spec equivalent for audio front end?
>
>Thanks

I got a set of NOS RCAs for my Citation II from Ned about 6 months
ago, which I like a lot. These replaced a motley assortment (mostly
Zenith branded), and were a definate improvement.

Bob Schneider
bobsch...@nospam.worldnet.att.net
sch...@nospam.premk.com
The views expressed are not those of my employer, my wife, or
the National Football League.
All rights reserved.

OvrReactor

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Oct 1, 1999, 3:00:00 AM10/1/99
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I have a few of these in my "archives" (quite a few, actually). The GE boxed
ones specify them as 12BY7A/12BV7/12DQ7. I have a few "plain old" RCA 12BV7's,
what's the diff?

Richard's post comments on the linearity of the curves. How is the linearity
affected by triode connection? (Which is sonically better, pentode or triode?)

BTW, a few of my 12BY7's are Japanese (Matsushita, I think). Are these as good
as US?

I'm asking all these questions because I was planning on selling off my stash
(I thought they were only good for RF), and I'm wondering if I should keep a
few to play with.

Regards,
Tom Mitchell

Sheldon D. Stokes

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Oct 1, 1999, 3:00:00 AM10/1/99
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In article <19990930220041...@ng-cf1.aol.com>,
ovrre...@aol.com-nospam (OvrReactor) wrote:


> I'm asking all these questions because I was planning on selling off my stash
> (I thought they were only good for RF), and I'm wondering if I should keep a
> few to play with.


They all suck, they are worthless, That's why my citation II sounds so
awful. I'll pay you for shipping for all you have. :)

I think they are a great little pentode with lots of great features that
make it fantastic to design with. I never do any designs with them though
because they are not in production anymore. I hoard them for my big
chocolate colored behiemoth.

Sheldon

Sheldon D. Stokes

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Oct 1, 1999, 3:00:00 AM10/1/99
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In article <wwCI3.923$ZV1....@dfiatx1-snr1.gtei.net>, "Stewart Ono"
<audi...@GTE.net> wrote:

> 12BY7's are used in the front end of a Citation II, I believe.


it should also be noted that it uses 6 of them. That's a lot of tubes for
drivers.


Sheldon

richard...@gmail.com

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Apr 15, 2018, 12:44:32 PM4/15/18
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The 12by7a’s are most notably used in the Vintage Harman Kardon Citation II tube amps. They were designed with an extremely wide frequency range, due in part to this tube’s capability. They are also used in the HK Citation V, a smaller version. I have two Citation II amps and have rolled most types of tubes through them both, including Sylvania, GE, Phillips, RCA, the original branded HK supplied tubes, some original Radio Shack gold plated tubes (that reveals my age) and JAN (Joint Army/Navy) military tubes. They all have their own unique sound signature and so the answer is determined by your preference, each is unique and its your own ear that will decide. I’ve read on other posts people like the RCA. Also heard original CBS tubes sound good, but difficult to find. I personally landed on JAN military tubes because they are so rugged and have a balanced sound signature that seems to gather in the best of the rest. But they all sound good, just diffferent.
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