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best
replacement tube for 7199 in old Ampegs?
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pula58

Joined: 26 Jan 2010
Posts:
402

Posted: Sun Jan 01,
2012 7:28 pm    Post
subject: best replacement tube for 7199 in old
Ampegs?

I'm working on an old
Ampeg Gemini (G12) for a friend. The phase-inverter tube is
shot, it's a 7199 pentode/triode.

That tube is no
longer made, and I don't want to pay NOS prices.

So,
what is the most commonly used replacement in these ampegs? I
realize I may need to do a little socket rewiring.

I
have seen some mention of using a 6U8 tube, and also a 6GH8A.

Any ideas would be appreciated!
P.

Last
edited by pula58 on Mon Jan 02, 2012 1:51 am; edited 1 time in
total

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ToneMerc

Joined: 26 Apr 2009
Posts: 2981
Location:
East Coast

Posted: Sun Jan 01,
2012 7:36 pm    Post
subject: Re: best replacement tube for 7199 in old
Ampegs?

pula58
wrote:

I'm working on an old Ampeg Gemini
(G12) for a friend. The phase-inverter tube is shot,
it's a 7199 pentode/triode.

That tube is no
longer made, and I don't want to pay NOS prices.

So, what is the most commonly used replacement
in these ampegs? I realize I may need to do a little
socket rewiring.

I have seen some mention of
using a 6U8 tube, and also a 6G8HA.

Any ideas
would be appreciated!
P.

http://www.ebay.com/itm/7199-6GH8-Tube-Socket-Adapter-Dynaco-Scott-Fisher-/160527785461?pt=LH_DefaultDomain_0&hash=item2560339df5

TM

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selloutrr

Joined: 14 Oct 2007
Posts: 3705
Location:
Southern California

Posted: Sun Jan 01,
2012 8:48 pm    Post
subject:

No direct sub, but a
6AN8 is the exact same tube as a 7199, just a different pin
out.
_________________
My
Daughter Build Stone Henge

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gary sanders

Joined:
13 Apr 2010
Posts: 350
Location: Cullman,Alabama

Posted: Sun Jan 01,
2012 9:07 pm    Post
subject:

I think I have a few
6G8HA pulls.Old GE ones.Let me know if you need
one

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Structo

Joined: 17 Oct 2007
Posts: 14630
Location:
Oregon

Posted: Sun Jan 01,
2012 9:53 pm    Post
subject:

Yeah, since that is
half pentode and half triode it makes finding a substitute
difficult.
_________________
Tom

Don't
let that smoke out!

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renshen1957

Joined: 20 Feb 2009
Posts: 464
Location:
So-Cal

Posted: Mon Jan 02,
2012 1:17 am    Post
subject: Re: best replacement tube for 7199 in old
Ampegs?

pula58
wrote:

I'm working on an old Ampeg Gemini
(G12) for a friend. The phase-inverter tube is shot,
it's a 7199 pentode/triode.

That tube is no
longer made, and I don't want to pay NOS prices.

So, what is the most commonly used replacement
in these ampegs? I realize I may need to do a little
socket rewiring.

I have seen some mention of
using a 6U8 tube, and also a 6G8HA.

Any ideas
would be appreciated!
P.

Hi

7199 - Triode -
Pentode 7199 Substitution

You can substitute the
following tubes in place of a 7199 tube with a 6BL8, 6EA8,
6U8, or 6KD8 provided that you make the following wiring
changes to your socket:

Move wire from pin 2 to pin 6,
pin 6 to pin 7, and pin 7 to pin 2

6BL8/6LN8 - Triode
- Pentode runs about $6.10 or less.

Two 6gh8A tubes
and socket adapters $35.00

http://www.ebay.com/itm/Two-6GH8A-7199-Tube-Socket-Adapters-New-6GH8A-Tubes-/130620681736?pt=Vintage_Electronics_R2&hash=item1e69996e08

Or AES has the tube for $35.00 not as big a hit to the
pocket book as some NOS Tubes. CE Dist. (wholesale arm of AES)
charges the same price.

Sovtek 7199 was about $15.95
but New Sensor took it out of production. To quote their
website "Sovtek Discontinued. Use 6U8A JAN Philips as a
subsititute. "

Best Regards,

Steve

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renshen1957

Joined: 20 Feb 2009
Posts: 464
Location:
So-Cal

Posted: Mon Jan 02,
2012 4:23 am    Post
subject: Re: best replacement tube for 7199 in old
Ampegs?

pula58
wrote:

I'm working on an old Ampeg Gemini
(G12) for a friend. The phase-inverter tube is shot,
it's a 7199 pentode/triode.

That tube is no
longer made, and I don't want to pay NOS prices.

So, what is the most commonly used replacement
in these ampegs? I realize I may need to do a little
socket rewiring.

I have seen some mention of
using a 6U8 tube, and also a 6GH8A.

Any ideas
would be appreciated!
P.

Hi,

I found these NOS Sovtek
tubes http://tubedepot.com/7199.html for
$16.00

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pula58

Joined: 26 Jan 2010
Posts:
402

Posted: Mon Jan 02,
2012 6:16 am    Post
subject: Re: best replacement tube for 7199 in old
Ampegs?

renshen1957
wrote:

pula58
wrote:

I'm working on an old Ampeg
Gemini (G12) for a friend. The phase-inverter tube
is shot, it's a 7199 pentode/triode.

That
tube is no longer made, and I don't want to pay
NOS prices.

So, what is the most commonly
used replacement in these ampegs? I realize I may
need to do a little socket rewiring.

I
have seen some mention of using a 6U8 tube, and
also a 6GH8A.

Any ideas would be
appreciated!
P.

Hi,

I found these NOS
Sovtek tubes http://tubedepot.com/7199.html for
$16.00

I looked, they are not actually
available.

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rdjones

Joined: 31 Aug 2010
Posts: 819
Location:
Music City, TN

Posted: Mon Jan 02,
2012 6:44 am    Post
subject: Re: best replacement tube for 7199 in old
Ampegs?

pula58
wrote:

I'm working on an old Ampeg Gemini
(G12) for a friend. The phase-inverter tube is shot,
it's a 7199 pentode/triode.

That tube is no
longer made, and I don't want to pay NOS prices.

So, what is the most commonly used replacement
in these ampegs? I realize I may need to do a little
socket rewiring.

I have seen some mention of
using a 6U8 tube, and also a 6GH8A.

Any ideas
would be appreciated!
P.

Without making an analysis of the cost
and availability of recent production vs NOS or "good used"
...

Sunn changed from the 7199 that was used in their
original designs (Dynaco circuit) to the 6AN8.
6AN8 is
also used in a few other guitar amps.

My first
instinct might be to convert to the 6AN8 wiring pinout, but
like the 7199, 6AN8 is the only common 6 volt tube with it's
base pinout.

The 6U8 base pinout is shared with a
number of other 6 volt tubes including 6GH8.
http://www.nj7p.org/Common/Tube/SQL/Tube_query.php?base=9AE

This will give you some choices for "rolling" if you want
to spend time doing that.

The 7199 was designed from
the start as a high spec audio tube.
A replacement tube
type might not perform quite as well in terms of noise and
microphonics but as a driver/inverter this should be a lesser
concern.

rd

Last edited by rdjones on Wed May 09,
2012 6:21 pm; edited 1 time in
total

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selloutrr

Joined: 14 Oct 2007
Posts: 3705
Location:
Southern California

Posted: Mon Jan 02,
2012 7:24 am    Post
subject:

I canthelp but think if
you want the amp to sound correct $18-50 for a nos tube is
just the cost of owning this amp. You are in it at least that
amount if you consider bench time to rewire the socket. Since
the tube is specialized and low noise / microphonics the
possible replacements are of a lower quality. It's one of
those times you just have to pay up and admire the fact it's
correct.
_________________
My Daughter Build
Stone Henge

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RightLurker

Joined:
19 Dec 2009
Posts: 83

Posted: Tue Jan 03,
2012 8:44 pm    Post
subject:

Antique Electronics
Supply (tubesandmore.com) sells plug-in converter that allows
you to substitute a 6GH8A for the 7199. They sell the
converter for about $20, I think. Just search "7199" on their
page and you'll find it.

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cobalt

Joined: 20 Aug 2006
Posts:
83
Location: New Hampshire, USA

Posted: Wed Jan 04,
2012 3:18 am    Post
subject: 7199

I've bought tubes from
this guy before.

http://www.ebay.com/itm/2-NOS-Sylvania-7199-Radio-Vacuum-Tubes-Audio-PreAmps-/270883683787?pt=Vintage_Electronics_R2&hash=item3f11ecfdcb

good luck!
weirddave

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crbowman

Joined: 26 Jul 2009
Posts: 459
Location:
Austin, TX

Posted: Wed May 09,
2012 3:27 pm    Post
subject:

I know this is an old
thread but just saw it and thought I'd pass this along.

about 20 years ago I asked a local tech this same question.
His reply was that he didn't know of a direct plug-in
substitute but he gave me a number for a tech that he said
"knows more about Ampegs than just about anyone" so I call the
guy.
It was Ken Fischer!
So I'm talking to Ken and he
says 'what's wrong with using a 7199?'
I tell him the
cheapest one I can find is NOS for $45.00.
Ken hit's the
roof.
'Fourty five bucks! Are you kidding me!' (with
thick Jersey accent)' That's fricken highway robbery!
Holy.......fourty five bucks!!!......' voice trails away and
I can hear him rummaging around.
'Nah, you gotta use a
7199. I've got one here I'll give you for five bucks. Just
send me a money order or something OK?'
Three days later I
get a really nice old Sylvaina 7199 pull courtesy of Ken
Fischer.
Nicest guy ever.
_________________
"I've suffered
for my music. Now it's your turn."

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skyboltone

Joined: 10 May 2006
Posts: 2285
Location:
Sparks, NV, where nowhere looks like home.

Posted: Wed May 09,
2012 4:15 pm    Post
subject:

Get a NOS. The tube
will last for years.
_________________
The Last of the
World's Great Human Beings
Seek immediate medical
attention if you suddenly go either deaf or blind.
If you
put the Federal Government in charge of the Sahara Desert, in
five years time there would be a shortage of sand.

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tictac

Joined: 31 Mar 2006
Posts:
429

Posted: Wed May 09,
2012 8:18 pm    Post
subject:

With plenty of good
sounding 6GH8A, 6BL8/6U8 tubes available there's no reason to
use 7199's unless you really want to pay more...

H.H.
Scott amps briefly used 7199's in their amp but quickly
switched to the 6GH8A, 6BL8/6U8 family of tubes and used them
in mosts of their tube amps from that point on....

my
.02

TT

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