>
>
>2 wrote:
>>>...
>>>I have an amp with a pair of gg 813s with a burn in the middle of the choke.
>>>
>>
>> ** Interesting. How many uH ? What are the lowest/first four choke
>> resonances?
>>
>> tnx,
>> Gary
>>
>> - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
>
>Hi Rich,
>
>I am pretty sure that the choke is a National R175A. It has several pie
>sections on it. I think it is 145 micro henries. One catalogue says 225
>but a couple of reference say 145.
Thanks. My experiences are with single-layer solenoid wound chokes. The
pi-wound chokes I have dipped were a Pandorra's box.
>
>Never measured resonance. Built that amp about 35 years ago. Used to run
>around 3 to 3400 volts on it. I think that the choke burned when on 15
>or 20 meters. I smoked a few band switch sections in it too. Although
>the band switch was never really big enough.
The bandswitch should DC hi-pot at 75% more than the anode PS.
>
>Still have the original tubes in the amp. Couldn't kill them. It is on a
>smaller power supply now. About 2300 -2400 volts. Haven't tried it on 15
>meters in many years. Did have it on 20 some months ago and it worked
>fine. Even with the burned choke.
>
tnx, Gary
- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
www.vcnet.com/measures.
end
|