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RE: Cobalt SET 45

Posted by tgnade (A) on November 3, 2015 at 00:18:53

In Reply to: Cobalt SET 45 posted by tgnade on November 2, 2015 at 11:16:24:

http://www.audioasylum.com/forums/magnequest/messages/2919.html

I think these are the only suggested changes I can find so far. I found a reference to the EXO-004 plate choke (60ma, 50H, 317Ohm)

http://www.meter.com/forums/tubediy/messages/22/edit/22785020140508122642.html

It looks like the EXO-003 is a closer match than the BCP-15, though it has lower inductance, higher dc resistance, and I would guess a larger voltage drop. If the only concern is inductance, then why not just go with the Dowdy?

Are there any further updates or changes you would suggest?

On DIYAudio, Audiowize suggested the following change as well:

"The only change I would make is to replace the zener diode and cap in the current source with a 33K resistor in parallel with a 10,000uF/6V cap. Without spending a lot of extra money, a pair of 0D3's in series would give you a regulated voltage supply for your driver, allowing you to control the potential voltage across the MJE-350."

What do you think of those suggestions?

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