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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 20th December 2016, 06:59 PM   #11
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And could you clue me in on where I check filament supply. At the tubes, but which pins?

Last edited by mkane77g; 20th December 2016 at 07:01 PM.
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Old 20th December 2016, 07:04 PM   #12
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I believe that will have to be an electrolytic capacitor. Value should be close and voltage rating should be what is called for or higher.
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Old 20th December 2016, 07:09 PM   #13
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Thanks you for your help. I have nothing close to 1500uf. Looks like a trip to RS. 2 hours round trip. Oh well.
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Old 20th December 2016, 07:26 PM   #14
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I flipped the 4700 electrolytic and no B-voltage. Think I killed it. Rat Shack has none.
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Old 21st December 2016, 03:13 PM   #15
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Quote:
Originally Posted by mkane77g View Post
And could you clue me in on where I check filament supply. At the tubes, but which pins?

Pins 1&4
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Old 21st December 2016, 10:20 PM   #16
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B- is only 190v??????????
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Old 22nd December 2016, 12:01 AM   #17
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^^^^^^^^^^^^And B+ is about 25v. That's with one 5842 in place. Opinions please.
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Old 22nd December 2016, 01:46 AM   #18
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Ok, some progress I suppose. I now have 225v B+ and 190v B-. All tubes in but the 45's.
suppose I need to increase the value of C4
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Old 22nd December 2016, 01:51 AM   #19
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I'll bet my FREDS orientation is wrong.
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Old 22nd December 2016, 02:54 PM   #20
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That wasn't the reason voltage is low. With a rectifier tube in voltage is 200 both sides. Guess I'll run with it. Here's my second attempt at a base. My top plate has been shipped.

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