DHT driver for paramount

ducati guy · 4523

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Offline ducati guy

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on: December 30, 2009, 03:30:43 AM
I was wondering if anyone has tried a DHT as the driver, using separate tubes for the shunt regulator and driver. Not sure how complicated it might be, but it piqued my interest. Would a 26 be an appropriate driver?


Offline Len

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Reply #1 on: December 30, 2009, 04:53:35 AM
I'm in the middle of wiring in a 3a5 for the driver in my Excite. Running at 4ma, 100V just like the 5965, so the C4S remains the same. 4 D cells for filaments to start, series/parallel for 2.8V about 100ma IIRC.

I'll post results when it's done.

Paramours
Paraglows
Excites
Heavily modded Soul Sister and Groove Thang
Quickie modded to active low pass filter
Quickie modded to headphone amp
Lots of Bottlehead parts used for building other stuff

Offline Paul Joppa

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Reply #2 on: December 30, 2009, 06:41:16 AM
Here are three problems you must work around to do this:

1) two independent filament supplies, since the shunt regulator is cathode-driven

2) Low gain - 12AT7 has a mu of 60, most candidate DHT drivers will be around 10.

3) Relatively few DHT drivers are rated for high plate voltage - the regulator must sustain 350v (300v when the new board is ready)

There are solutions to all these of course. Good luck!

Paul Joppa

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