[Amps] Limits of a Power transformer

[Tom W8JI]

> Nat Gurumoorthy wrote:
>> Hi,
>> I am in the process of scrounging together parts for a 
>> linear
>> amp. I have a pair of GI-7BT. I have acquired a Triad 
>> P-14A (115
>> primary, 1780V 250ma CCS secondary) Weighs about 14lbs. 
>> Secondary
>> resistance seems to be about 160 ohms.

I think you'll find a 160 ohm ESR transformer has horrible 
regulation.

The hypersil in the AL12 series for example has about 10 
ohms of secondary resistance. The AL-811 around 20 ohms ESR.

With 160 ohms secondary resistance the value of capacitance 
does not matter nearly as much, so I'd not worry about 
having higher values of C. As Steve points out, all it does 
is complicate stored energy problems.

I'd look at that transformer real close before using it. 
Odds are it was never designed for capacitor input solid 
state supplies.

73 Tom