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DHT 01a tube preamp







Some time back I built a 71a preamp with 100 year old Cunningham tubes. This 01a amp is similar but these tubes have more gain. Once more Cunningham tubes. Regulated DC of course on the heaters and a resistor divider to balance the voltage further. Has its own RFI/EMI power filter for a cleaner mains. Hammond power tranni.

Mundorf EVO Oils for output caps and remote control Alps Blue velvet pot. Fine silver plated copper wire for hookup and mostly carbon film resistors. Remote PS with double Pi filter for HT. 300uf of 400V filter caps. Had some hum issues but by reducing the gain managed to get this right down. Love the colour - Iron Stone - and the look. Excellent to listen to.
| retro-thermionic |



Edits: 02/13/25 02/13/25 02/13/25 02/13/25 02/13/25

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Topic - DHT 01a tube preamp - mwhouston 16:27:18 02/13/25 (54)

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