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Hoffman Amps Forum image Author Topic: Single Ended Spitfire  (Read 1385 times)

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Offline jjschessmaster

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Single Ended Spitfire
« on: May 02, 2024, 08:19:44 am »
Looking at purchasing a single ended amp that runs a 5e2 princeton preamp into the power amp.  I'm looking at modding the amp to use a matchless spitfire preamp (parallel triodes) vs the cascade of the princeton.  Question is ultimately the spitfire is a push pull amp with a phase inverter.  Is there a "significant" impact of omitting phase inverter circuitry by splicing the spitfire preamp onto a single ended power amp?  I know its all subjective, but curious if there are any gurus that have tried this or see a glaring "don't even try, without replicating PI".  My real concern is gain difference between parallel and cascaded triodes wouldn't give enough juice to the power amp.
« Last Edit: May 02, 2024, 08:43:16 am by jjschessmaster »

Offline sluckey

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Re: Single Ended Spitfire
« Reply #1 on: May 02, 2024, 08:52:25 am »
You don't have to replicate the PI but you will need another gain stage. Otherwise, your amp will likely be very quiet and lifeless.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

 


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