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December 06, 2022, 11:04:22 AM

Author Topic: How to identify output transformer wiring  (Read 143 times)

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Offline gsharri

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How to identify output transformer wiring
« on: September 03, 2022, 01:54:47 PM »
I recently purchased a pair of Paramount 300b amps. I am not sure how the output transformers are wired (4,8, or 16 ohms). Is there a manual or diagram available?
Thanks
Scott

Offline Paul Joppa

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Re: How to identify output transformer wiring
« Reply #1 on: September 03, 2022, 06:00:28 PM »
Yes, there is a short (one page) document on that transformer. I have attached it in PDF form. It shows the wiring for a 4-8-16 ohm switch using a 2-pole 3-throw switch.
Paul Joppa

Online Paul Birkeland

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Re: How to identify output transformer wiring
« Reply #2 on: September 03, 2022, 06:29:03 PM »
This is the most likely configuration.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline gsharri

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Re: How to identify output transformer wiring
« Reply #3 on: September 06, 2022, 08:05:15 AM »
Thank you both!
I purchased these from Gig Harbor Audio last week. Erik, there, told me they had been "modified by Paul at the factory" but didn't say when that occurred. Would that be one of you?
Scott

Online Paul Birkeland

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Re: How to identify output transformer wiring
« Reply #4 on: September 06, 2022, 08:35:43 AM »
Yes, I changed them to use the 6LU8 after using them for a few years. 
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man