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suggestion....

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Sector-7G

(A)

In Reply to: 6V6 Parafeed with "Robin Hood" iron. posted by G on June 08, 2004 at 04:51:43:

HEy-Hey!!!,
Since you already have a grid choke for the 6V6, why not go fixed bias? This will get rid of the imperfect cathode resistor-capacitor combo, and give you a bit of free headroom.
Knock B+ down into the high 200's and you'll be able to run almost any of the traditional audio power valves. EL34, 6L6, or the almost-6V6's the 6EY6 and 6EZ5. or rig an adapter up and plug in EL84's...
Anyway, I look forward to hearing from you about how it sounds.
regards,
Douglas

Follow Ups:

Re: suggestion.... - G 08:50:54 06/08/04 (2)
It was suggested that a string of LEDs under the cathode of the 5687 would be the best way to bias it. I have never tried fixed biasing nor using LEDs in that way. It will be a while before I build the design ,as I've just finished a SE EL34 amp and I am saving my pennies for a tube buffered volume control to go with it, but when I do I will certainly try both methods on the breadboard before I finalize it. Thanks for the reply.
G
- Re: suggestion.... - Sector-7G 09:12:32 06/08/04 (1)
  Three or four red, 20 mA LED's will do quite well for the 5687. Anyway, have fun with it. If you build it heavier than you need to at first, there is more room to fiddle with things later. IMO a very good practice for evolving DIY projects. It has been cheaper for me in the long run!
  regards,
  Douglas
  - Re: suggestion.... - G 12:19:30 06/08/04 (0)
    Never fear. I am an accomplished "overbuilder" :). Thanks Douglas. Cheers.

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