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801A amplifier










Hi All
Just finished a 801A amp, something I have been planning to do for few years and finally got to it.

Initial impressions - clean tops and mids, and the lows are nice and tight. J&K audio xformers give this tight sound to the lows. I will be installing their nano-crystal 5K o/p transformers in my 811A replacing my James sometime in the next few months.

- Filament supplies for 801A's are Guido Supplies
- Bias supply is using Pete Millet's bias supply boards
- Input and driver tubes are 6EW7 dissimilar dual triodes in one tube perfect for this application
- First stage is cap coupled using Duelunds
- Second stage is 2:1 stepdown Lundhal IT, which should be good for brief A2 transitions

Power transformer is custom Heyboer. Initially I started with 2 X 6AU4's for full wave rectification, messed up in the drilling for the octal openings and opted for using UF4007's for rectification and a single 6AU4 for slow start on

Next amp in line - as of now, the plan is a 2 stage amp using 12GN7 as the gain stage and using mosfet source follower to drive 211 grid.

cheers
ganti


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Topic - 801A amplifier - sganti 11:02:31 04/03/16 (8)

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