Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: TIMBO on April 07, 2019, 04:12:39 am
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Hi guys, Another local built amp from the late 60's.
(https://i.imgur.com/FK7UKtx.jpg)
(https://i.imgur.com/ZII4rfX.jpg)
(https://i.imgur.com/zPbTmgL.jpg)
(https://i.imgur.com/1Butv0A.jpg)
(https://i.imgur.com/qKut2OQ.jpg)
(https://i.imgur.com/bX3lUfo.jpg)
(https://i.imgur.com/s1cuH9z.jpg)
(https://i.imgur.com/nbCVlCM.jpg)
(https://i.imgur.com/i8DIIfK.jpg)
(https://i.imgur.com/OjPEpOB.jpg)
The only mod to the preamp is on channel 3.
The OT has a 4ohm tap so dropping two power valves and using an 8ohm load will do the trick.
I'm not sure if the feedback resistor needs to be tweaked, sounds good as is.
I've done most of the recap just waiting on a delivery.