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Discussion in 'Amplifiers' started by Crusher, Dec 12, 2010.
Circuit Improvements for the Heath SB-220 Amplifier
good reading for your 220
Improved Anode Circuit Parasitic Suppression for Modern ...Tubes
Good read on the parasitic suppressors
BUT, if you are a "ten" meter operator, beware! The Nichrome suppressors at 10 meters will turn a slight orange when you're keyed up.... The nichrome DOES dissipate some power at 10.
Brass makes a great parasitic choke... Just make sure you look at a 'skin depth gauge' and ensure you're using brass that's thick enough....
I PREFER to make hairpins for my inductors.... I've had better luck with them, you can assemble the resistors to be IN the airflow, AND that helps keep them fresh, so to speak... Look to the Pride DX300 / KW-1 for this type.
That is enough to build parasitic chokes for a few years.
Let us know how it turns out.
I salvaged a few plate transformers from some medical equipment today.
Got plenty of KV's for that all bander pair of 3-500's I am planning to build.