Bottlehead Forum
General Category => General Discussion => Topic started by: dfries on January 13, 2025, 02:45:06 PM
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Hello, I’d like to upgrade the output transformers on my Paramour. I’m hoping someone can tell me if the Iron Upgrade Kit for S.E.X. Kit 2.0 will work or if there are other suggestions. It seemed like their compatibility might have depended on the power transformer which is a Hammond H300668. Thanks
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Yes, you can put this iron onto a Stereomour. It's bigger, so it fits sideways in some of the holes that are placeholders for the TFA-2004/204.
The typical hookup is the blue plate choke wire to pin 2 of the 2A3 socket and the black wire to B+. The output transformer connections for the primary are 5 and 10 and well enough called out in the manual to get through. The SEX iron upgrade uses the output transformer as an 8K unit and the Paramour is optimized for 4K. You'd want to wire for 16 ohm output in the SEX iron upgrade manual for 8 ohm operation in the Paramours. 3.3uF is a good choice for the parallel feed cap.
These photos are only really helpful in terms of showing how the iron fits into the amps. You'll need to use tin snips to trim the mounting flange on one end of each output transformer so it doesn't run into the wood. The amps I put these into got a pretty substantial rebuild and migrated away a bit from the standard layout.
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Paul, thank you for the quick and very detailed reply.
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The old plate choke is re-purposed as a power supply choke, replacing the 27- ohm 5 watt resistor.