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Author Topic: Power tubes  (Read 28027 times)
oldpicker
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« Reply #30 on: May 11, 2010, 06:24:51 PM »
Just curious. What is your plate voltage, Tonequest?
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oldpicker
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« Reply #31 on: May 11, 2010, 08:54:15 PM »
Measure between pin 3 and pin 8 to get actual voltage I think. Can others verify?
Link to bias calculator and charts:   http://www.webervst.com/tubes1/calcbias.htm 
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oldpicker
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« Reply #32 on: May 12, 2010, 04:08:23 PM »
Tonequest,
   You just need a good multimeter and be very carful what you touch. Very lethal voltages inside of these amps due to the capacitors.  Here is a link that will explain step by step. Look under fixed bias.

http://www.diyguitarist.com/GuitarAmps/PT-Biasing.htm
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Emiel
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« Reply #33 on: November 30, 2010, 07:14:54 PM »
I just replaced the SED Winged C EL34's in my OTS with TAD 6L6WGC-STR. Biased them around 39-40 mA.

First impressions: improvement! The 6L6's give a more compressed feel, less in-your-face. A bit darker and thicker as well. This is at a low volume level though. I really think EL34's need some proper (stage) volume to get the best out of it. At low levels it can sound a bit thin and bright. At these conditions I get a more pleasing sound with the 6L6's. Can't wait to turn it up more.
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212Mavguy
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« Reply #34 on: December 15, 2010, 12:35:30 AM »
Winged C el34's tend to be a bit on the bright side anyway.  I know that their 6l6gc's also can also be pretty bright for a 6l6 type.  A slight adjustment to the hotter side of biasing can help in both instances. 

I've been busy on fleabay stocking up on VOS power tubes for my incoming 50w HRM head, a pair of GE 6l6gc's, a pair of what appear to be early Sylvania (Conn labeled) 6l6gc's, a slightly used pair of TAD 6l6wgc's, and a couple pairs of Siemens el34's.  Starting to Jones a bit... Wink       
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JD0x0
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« Reply #35 on: December 15, 2010, 09:39:06 PM »
Currently running Shuguang KT88's @ 64mA. Huge improvement over both the JJ 6L6's and Winged C, Shugaung EL34's
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bluesfendermanblues
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« Reply #36 on: December 15, 2010, 11:15:15 PM »
Quote from: JD0x0 on December 15, 2010, 09:39:06 PM
Currently running Shuguang KT88's @ 64mA. Huge improvement over both the JJ 6L6's and Winged C, Shugaung EL34's

in terms of dynamic range ? warmer midrange or ?
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Respect for the big guy's work....we're at this part of the forum because of HAD's amps.
JD0x0
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« Reply #37 on: December 16, 2010, 05:09:32 AM »
huge midrange and bass with present highs. Overall pretty balanced, no harshness, full sounding.

I'll try to get a soundclip up asap.
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