[ARC5] Solid State 6AL5

[Bob kb8tq]

Hi

Tube diodes start acting like diodes at much higher voltages than their solid state
cousins. Numbers in the 5 to 10V region are not uncommon for the “start of current”
point. They also have a pretty long non-linear region after that. 

Bob

> On Feb 5, 2018, at 2:08 PM, Peter Gottlieb <kb2vtl at gmail.com> wrote:
> 
> What is the I-V curve like in a 6AL5?  Does it start acting like a diode at lower voltages than a Ge diode like a 1N34A?
> 
> 
> Peter
> 
>> On Feb 5, 2018, at 1:47 PM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
>> 
>>> 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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