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Anything speacial about the ot in the lightning Ive noticed they have 4 and 8 ohm outputs only ? also whats acceptable plate voltage range? what size is the choke? if i skip the choke what a good resistor to replace it with 1.5K sound about right to start, what should it be biased at?, what about a master volume is it a useful mod, thanks mark

Mark, take a look at the TC-15 drawings in the Resources section. I think that will answer most of your questions. The TC-15 is basically kind of a Lightning with an additional EF86 channel. By default it doesn't use a choke. Matchless' OTs for the Spitfire/Hurricane/Lightning family are designed to provide a 4k load impedance to the EL84s. Trinity uses the Trinity 18W OT for the TC-15 (as well as the 18W PT), which has 5k primary tappings - close enough to what Matchless' OT has. HTH

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Great tones come in small glass jars!

ive built mathless lightnings befor and they never sound right, ive been using the wrong ot thanks zap you sure do get around mark

I would really recommend trying the Trinity OT, and also using no choke in the power amp. IIRC the Trinity OT is a good bit cheaper than the West Labs one and I think you will like what you hear.

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Great tones come in small glass jars!

Hi, I already have the West Labs transformers and have just ordered the TC15 kit from Stephen. I have the choke, would you be suggesting I do not use it. Naturally I have no idea whether it impacts on tone whatsoever so look forward to the response.

Put the choke in, but have a switch so you can bypass it. With the choke engaged the amp will have a softer, looser feel.

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Great tones come in small glass jars!

Great idea, thanks for the advice.