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In Reply to: RE: C3m - 300b amp posted by jetrexpro on March 04, 2015 at 05:33:41
I made these amps with conventional power supplies back in the 90's, and they sound great. With the C3M's and Tango outputs they don't have the stereotypical limitations of SE 300b amps at all. Very fast and dynamic, with tight bass. I now use .47uf Jupiter copper HT caps, also grid chokes. I am about to install a couple of Tentlabs regulated DC filament supplies on the 300b's. David
Follow Ups:
Hi David Lawrence do you use the grid choke on the input tube or the finals tube? What brand and value?
Also did you use AC on the heaters of the 300b before switching to DC?
Are you using AC or DC on the C3M? Did you raise this tube above ground using a the center tap of the 20V filament transformer?
thanks
The grid chokes are for the 300b's. I forget the brand, maybe Stevens and Billington, and the value. Brian Cherry sold them to me many years ago when I was living in Hong Kong.
I once had DC filament circuits, following the Audio Note 300b Quest schematic (the amp's previous diy incarnation), and then switched to AC. I like the AC except have found the hum bothersome in the long run, especially with very sensitive speakers.
I forget what I did on the C3M filaments, but I just followed Thorsten's schematic.
Perhaps I'll have more to report as I hope soon to find time to open the amps again for the Tentlabs filament supplies...
David
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