Can i use this PT with Tubelab SE? - diyAudio
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Old 21st February 2014, 05:22 PM   #1
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Default Can i use this PT with Tubelab SE?

I've got a really nice, in the original box / unused Chicago PSR-85 power transformer that i'd like to use with the Tubelab SE project with #45 tubes. It's probably from the 1950's / 1960's.

It's got the 5V @ 2A and 6.3V CT @3A no problem.

But, the HT is 440-0-440 @85ma, (which it says on the box is 325 DC with a 5Y3 or equivalent) which is above the spec of "540 or 550 VCT at 125mA"

Will there be too much B+ after rectification for this circuit?

Should i use this thing or save it for another project?
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Last edited by Magnetmaz; 21st February 2014 at 05:24 PM.
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Old 21st February 2014, 09:01 PM   #2
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additionally, i have a slew of NOS vintage rectifiers at my disposal... 83's, 5V4, 5U4, 5Y3, 5Y4. What if i used one of those with more of a voltage drop on it ( more than the GZ34 / 5AR4) ? That might bring it down to a more suitable level.

I'll just have to wire a standby switch or some sort of soft-start circuit to protect these globe 45 beauties i have!!
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Old 22nd February 2014, 01:01 AM   #3
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Help will be along. I'm clueless but figured I would make sure you stay near the top
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Old 22nd February 2014, 02:34 AM   #4
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I think it's going to be too much voltage. Going to have to source a smaller one. Shame because this transformer is potted and pretty and I got it cheap
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Old 22nd February 2014, 03:41 AM   #5
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440-0-440 is 880 volts CT and you need about 550 volts....yes it's too much voltage. The 325 DC they are quoting is with a choke input filter which will not work with the negative bias circuit. You will have about 500 volts of negative bias.
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