RE: Do i need to modify this driver circuit for PSE KT88

Posted by sonicboom (A) on August 28, 2014 at 09:13:39

In Reply to: RE: Do i need to modify this driver circuit for PSE KT88 posted by sonicboom on August 27, 2014 at 18:29:16:

Had another look, you could use your octals with the same resistors as used in the EL34 PSE, by making two revisions. Change the cathode resistor of the input tube to 1.5K and set the B+ voltage feeding both the input and driver tubes to 380V. This will bias the 6SL7 at around -1.5V, with just over 1mA of current going through it and about 150V at the plate. With the 22K at its cathode, the 6SN7 will be biased at around -7V with plenty of room for swing at ~40V RMS. Use PSUD II to figure out the dropping resistor to set your your B1+ to 380V.

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Follow Ups Full Thread

Topic - Do i need to modify this driver circuit for PSE KT88 - DAK 13:40:47 08/26/14 (15)

RE: Do i need to modify this driver circuit for PSE KT88 - Paul Joppa 19:06:12 08/27/14 (1)

RE: Do i need to modify this driver circuit for PSE KT88 - sonicboom 19:47:06 08/27/14 (0)

RE: Do i need to modify this driver circuit for PSE KT88 - Stuben 11:58:11 08/27/14 (6)

RE: Do i need to modify this driver circuit for PSE KT88 - DAK 14:49:47 08/27/14 (5)

RE: Do i need to modify this driver circuit for PSE KT88 - Stuben 09:58:03 08/28/14 (4)

RE: Do i need to modify this driver circuit for PSE KT88 - DAK 10:37:47 08/28/14 (3)

RE: Do i need to modify this driver circuit for PSE KT88 - Stuben 11:08:20 08/28/14 (2)

RE 6BX7 as a driver - DAK 16:23:13 08/29/14 (1)

RE: RE 6BX7 as a driver - Stuben 10:50:48 09/02/14 (0)

RE: Do i need to modify this driver circuit for PSE KT88 - sonicboom 11:31:19 08/27/14 (5)

RE: Do i need to modify this driver circuit for PSE KT88 - DAK 15:30:38 08/27/14 (4)

RE: Do i need to modify this driver circuit for PSE KT88 - sonicboom 16:51:12 08/27/14 (3)

RE: Do i need to modify this driver circuit for PSE KT88 - DAK 17:42:49 08/27/14 (2)

RE: Do i need to modify this driver circuit for PSE KT88 - sonicboom 18:29:16 08/27/14 (1)

RE: Do i need to modify this driver circuit for PSE KT88 - sonicboom 09:13:39 08/28/14 (0)

Follow Ups

RE: Do i need to modify this driver circuit for PSE KT88 - sonicboom 09:13:39 08/28/14 (0)

RE: Do i need to modify this driver circuit for PSE KT88

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