[ARC5] Solid State 6AL5

[Kenneth G. Gordon]

On 5 Feb 2018 at 13:38, Bill Cromwell wrote:

> Hi Ken,
> 
> Are the 1N34 germanium?

Yes.

> If so I wonder how newer silicon devices would 
> work or even silicon power rectifiers.

I wonder too, but I did't try those at the time.

> I am getting more interested in 
> this and I will try to compare the tube vs solid state agc circuits I 
> have on hand here. We know that solid state devices can work in agc 
> circuits because they do in existing radio gear.

Yes, but SS AGC circuits are, of course, designed differently from tube-types. I would think 
that some sort of FET would work better than straight diodes, though.

> To the original question about just plugging SS diodes into those tube 
> circuits - maybe not. It seems the whole idea is to NOT modify the radio 
> and keep the option of plugging in the diode vacuum tubes. Mods may be 
> required.

Yes.

> Related to this but with the shoe on the other foot I am interested in 
> trying double balanced diode rings with 6AL5 and 6H6 tubes. Somebody is 
> sure to tell me it can't be done. In that case I will find out why :)

Yes. That HAS been done. I have an article around here somewhere on doing just that. As I 
remember it, there was some difficulty with balance issues.

Later,

Ken W7EKB

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