After reading an article about building an amplifier which used ten 1625's
with paralleled RF but with series filaments directly across the 120-volt
line, I've been saving them; hope to find the right round tuit someday....
=================================
Considering that with so many valves (tubes) in parallel operation the
inter-electrode capacitance is multipled accordingly, it would be intriguing
to know up to which frequency this set-up could be sensibly used.

I have quite a number of 'never used' 807s in the junkbox , pardon me
.........NOS box.

Frank GM0CSZ / KN6WH

After reading an article about building an amplifier which used ten
1625's
with paralleled RF but with series filaments directly across the
120-volt
line, I've been saving them; hope to find the right round tuit
someday....
=================================
Considering that with so many valves (tubes) in parallel operation the
inter-electrode capacitance is multipled accordingly, it would be
intriguing
to know up to which frequency this set-up could be sensibly used.


I have seen a CB amp using as many as 12 of the 1625 tubes. There were 6 in
parallel on each side of a push pull circuit. Not sure how clean the output
was but they seemed efficiant enough to give about 300 to 500 watts out of
carrier power and the modulation sounded good.

Low plate resistance swamps the capacity ;o)
73, Dave, N3HE

"Highland Ham" wrote in message
...
SNIP=================================
Considering that with so many valves (tubes) in parallel operation the
inter-electrode capacitance is multipled accordingly, it would be
intriguing
to know up to which frequency this set-up could be sensibly used.

I have quite a number of 'never used' 807s in the junkbox , pardon me
........NOS box.
SNIP

"David J Windisch" wrote in message ...
Low plate resistance swamps the capacity ;o)
73, Dave, N3HE

"Highland Ham" wrote in message
...
SNIP=================================
Considering that with so many valves (tubes) in parallel operation the
inter-electrode capacitance is multipled accordingly, it would be
intriguing
to know up to which frequency this set-up could be sensibly used.

I have quite a number of 'never used' 807s in the junkbox , pardon me
........NOS box.
SNIP

OK, we are all agreed - EVEYONE has heaps of 807's in the junkbox for
the "one day" project.......
73 de VK3BFA Andrew

This is hilarious. The OP asked a question. And asks it again:

What's the nomenclature for that sweep tube, produced just for Admiral TVs
years ago, that's heavier-duty than any of the other tubes?

I thought it was 6MJ6 -- but, no. It has an *octal* base.

Fella used to sell 'em in some of the mid-west hamfests, but I haven't seen
him for a while. Think his name is Don, and that he was also in to Racal
receivers.

73, Dave, N3HE

"Andrew VK3BFA" wrote in message
om...
SNIP
OK, we are all agreed - EVEYONE has heaps of 807's in the junkbox for
the "one day" project.......
73 de VK3BFA Andrew

"David J Windisch" wrote in message ...
This is hilarious. The OP asked a question. And asks it again:

What's the nomenclature for that sweep tube, produced just for Admiral TVs
years ago, that's heavier-duty than any of the other tubes?

I thought it was 6MJ6 -- but, no. It has an *octal* base.

So what kind of base does your mystery tube have?

"David J Windisch" wrote in message ...
This is hilarious. The OP asked a question. And asks it again:

What's the nomenclature for that sweep tube, produced just for
Admiral TVs
years ago, that's heavier-duty than any of the other tubes?

I thought it was 6MJ6 -- but, no. It has an *octal* base.

So what kind of base does your mystery tube have?

Ah, nevermind. I see now that the "it" in your question is not the
6MJ6, but your mystery tube...

On 19 Jul 2004 15:38:46 -0700, (Mike Silva)
wrote:

"David J Windisch" wrote in message ...
This is hilarious. The OP asked a question. And asks it again:

What's the nomenclature for that sweep tube, produced just for
Admiral TVs
years ago, that's heavier-duty than any of the other tubes?

I thought it was 6MJ6 -- but, no. It has an *octal* base.

So what kind of base does your mystery tube have?

Ah, nevermind. I see now that the "it" in your question is not the
6MJ6, but your mystery tube...

perhaps it is just a silly request when he has nothing else to talk
about, it might be 6JS6, 6KD6, or perhaps it was 6JM6.... and
6JM6 GE Vacuum Radio Tubes is offered on internet and the
Current Price: $0.99

so, when 100 persons have commented, it might be a better idea to read
the type number on the glass again and tell us which type the question
was about???


http://home.online.no/~la8ak/e81.htm
---
J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm

The point is, that I don't know what the nomenclature is, and asked for help
with it in the OP.

"Someone" mentioned this tube in a post "somewhere" several years ago. I've
searched archives for faulty-memory-recollections of the nomenclature, to no
avail.

For latecomer Noeding: I'd like to get enough of them to experiment with
no-tune techniques, which might be practical with plate voltage around 600
and plate current of 4 or 5 amps. The "hilarious" comment referred to plain
old thread-wander ;o)

73, Dave, N3HE

"J M Noeding" wrote in message
...
On 19 Jul 2004 15:38:46 -0700, (Mike Silva)
wrote:

"David J Windisch" wrote in message
...
This is hilarious. The OP asked a question. And asks it again:

What's the nomenclature for that sweep tube, produced just for
Admiral TVs
years ago, that's heavier-duty than any of the other tubes?

I thought it was 6MJ6 -- but, no. It has an *octal* base.

So what kind of base does your mystery tube have?

Ah, nevermind. I see now that the "it" in your question is not the
6MJ6, but your mystery tube...

perhaps it is just a silly request when he has nothing else to talk
about, it might be 6JS6, 6KD6, or perhaps it was 6JM6.... and
6JM6 GE Vacuum Radio Tubes is offered on internet and the
Current Price: $0.99

so, when 100 persons have commented, it might be a better idea to read
the type number on the glass again and tell us which type the question
was about???


http://home.online.no/~la8ak/e81.htm
---
J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm