Circlotron

[Fai C]

I want to build this circlotron amplifier because this is much easier
for me to handle, especially I read enough posts about this amplifier
from other discussion forum.

http://www.audiodesignguide.com/Hybrid2011/index3.html

Since this amplifier original approach is making an integrated
amplifier and I want to build it as standalone amplifier because I
have a preamp with 1V in 4V out.

D3a has a plate resistance of 1.9K and gain of 70 (triode wired), and
I am thinking about putting 300B instead for its low plate resistance
700 ohm, but the gain is sacrifice for only 3.85. As with the 300B,
can I have less step down ratio through interstage transformer.

Also, I consider put a step up input transformer to compensate the
gain by using 300B.

Any suggestion??

Thanks!

[Don Pearce[_3_]]

On Thu, 15 Dec 2011 16:33:40 -0800 (PST), Fai C >
wrote:

>I want to build this circlotron amplifier because this is much easier
>for me to handle, especially I read enough posts about this amplifier
>from other discussion forum.
>
>http://www.audiodesignguide.com/Hybrid2011/index3.html
>
>Since this amplifier original approach is making an integrated
>amplifier and I want to build it as standalone amplifier because I
>have a preamp with 1V in 4V out.
>
>D3a has a plate resistance of 1.9K and gain of 70 (triode wired), and
>I am thinking about putting 300B instead for its low plate resistance
>700 ohm, but the gain is sacrifice for only 3.85. As with the 300B,
>can I have less step down ratio through interstage transformer.
>
>Also, I consider put a step up input transformer to compensate the
>gain by using 300B.
>
>Any suggestion??
>
>Thanks!

That seems like an awful lot of time, effort and danger to achieve
what has to be one of the poorest amplifiers ever. What is the
reasoning here?

d

[John L Stewart]

I want to build this circlotron amplifier because this is much easier
for me to handle, especially I read enough posts about this amplifier
from other discussion forum.

http://www.audiodesignguide.com/Hybrid2011/index3.html

Since this amplifier original approach is making an integrated
amplifier and I want to build it as standalone amplifier because I
have a preamp with 1V in 4V out.

D3a has a plate resistance of 1.9K and gain of 70 (triode wired), and
I am thinking about putting 300B instead for its low plate resistance
700 ohm, but the gain is sacrifice for only 3.85. As with the 300B,
can I have less step down ratio through interstage transformer.

Also, I consider put a step up input transformer to compensate the
gain by using 300B.

Any suggestion??

Thanks!

The circuit you reference appears to be an infinite money sink. At a parts cost of 1300 € the perfomance vs cost ratio is quite poor.

My zwei pfennig anyway, John

[Fai C]

On Dec 16, 8:33*am, Fai C > wrote:
> I want to build this circlotron amplifier because this is much easier
> for me to handle, especially I read enough posts about this amplifier
> from other discussion forum.
>
> http://www.audiodesignguide.com/Hybrid2011/index3.html
>
> Since this amplifier original approach is making an integrated
> amplifier and I want to build it as standalone amplifier because I
> have a preamp with 1V in 4V out.
>
> D3a has a plate resistance of 1.9K and gain of 70 (triode wired), and
> I am thinking about putting 300B instead for its low plate resistance
> 700 ohm, but the gain is sacrifice for only 3.85. As with the 300B,
> can I have less step down ratio through interstage transformer.
>
> Also, I consider put a step up input transformer to compensate the
> gain by using 300B.
>
> Any suggestion??
>
> Thanks!

Since the ciercuit has D3a there and wire in triode, it has plate
resistance of 1.9K. Can I have less step down ratio interstage
transformer if replacing tube with 1.265K? Let's say 3:1+1 or
2:1+1......?

Thanks!

[[email protected]]

There is nothing easy about the Circlotron, it's actually a
challenging project. It was mostly a workaround of the Unity Coupled
Mcintosh patents. Since hese are long expired....