Bottlehead Forum

It's pretty easy

74.93.252.93

In Reply to: RE: More info please.... posted by Gaspode on January 03, 2008 at 12:36:39

To build a "stock" 6SN7 FPIII, the only extra part you need (besides octal sockets and tubes) is to use a different ceramic power resistor on the heater wiring supply. I believe the value is .22 ohm (not sure what the wattage is...same as the kit-supplied one, and I think it's 5W). Please do a search for Mikey's 6SN7 Foreplay III and you'll see pics, and confirm the correct resistor value.

If you go to duncanamps.com and do a search for 12AU7 and 6SN7 tubes, you can print out the tube pinout configurations and compare them. The octal tubes have the two heater pins, and the triode sections (in a different order than the miniatures); all that's "missing" is the ground (pin 9 on a miniature) pin. You attach ground connections to the socket on an octal tube.

For the extended FPIII, all you need to do is piggyback the kit-supplied heater resistor on top of the existing one.

I hope that helps. :-)

Follow Ups:

RE: It's pretty easy - Larpy 14:18:43 01/03/08 (4)
- My heater voltage is 5.8 VDC - Steve Culton 17:19:54 01/03/08 (3)
  - RE: My heater voltage is 5.8 VDC - Paul Joppa 22:38:40 01/03/08 (2)
    - RE: My heater voltage is 5.8 VDC - Larpy 08:39:32 01/04/08 (1)
      - yes (nt) - Paul Joppa 15:03:00 01/04/08 (0)

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