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Old 21st February 2007, 08:05 PM   #11
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Quote:
Originally posted by tubelab.com
One reason is the lack of (or extreme cost) transformers of much higher than 800 VCT.
Well, the 282X is under $80 at Angela, and puts out 200mA into 1000VCT. Seems OK for me... (1 per 6L6 monoblock )
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Old 22nd February 2007, 02:15 AM   #12
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For the Machine with 5AR4 rectification, I use (if Hammond) the 372FX. I put a little (27ohms) resistance in series with the plates to take it easy on everything, and 6.8 or 8.2uF for the first cap before the (5H) choke. Cap on the output is 120uF. Onward to the input supply.

Anybody wants a schem, say so.

Aloha,

Poinz
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Old 22nd February 2007, 03:31 AM   #13
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Are Hammond Power transformers made in Canda?

I took mine apart and it looked like it was made in China.

All my 27XX series run real hot, would never use them again.

Art
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Old 22nd February 2007, 01:54 PM   #14
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Quote:
All my 27XX series run real hot, would never use them again.
They do get hot, but I have never had one fail (except for the one that got wet). Most of my early guitar amps used Hammond or Allied transformers and all of them are still cranking away. Some are over 10 years old now.

I have been puting them in SE amps (worst case for continuous current drain) for about 5 years. My latest amp has only been running for about 4 months. I am now drawing over 200 mA from a 150 mA rated (at 50 Hz) transformer (I changed tubes to EH KT88's and they sound best when run hot). It is often left on for hours at a time. Yes it gets hot, you don't want to hold you hand on it kind of hot. I should really change out the transformer for a bigger one, but I am considering this a "stress test". I will change it out if it blows up, this amp has the nicest chassis that I have done yet and I don't want to mess it up. It is already too crowded.
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