RH-7695

the thermionic watercooler

RH-7695

Postby TerrySmith » Thu Aug 08, 2013 11:42 am

I've had this Zenith 3L01 console amp laying around for years now and decided to play with it. It uses a 7695 tube for the outputs, and a 12AX7 input. The 7695 tube is used in series wired direct line voltage applications. The sound from the stock amp wasn't really good so I remounted the output transformers and tubes on a Hammond chassis and lashed it together with the RH-84 circuit. Now it sounds really good! The schematic below is the power supply, the rest of the circuit is standard RH-84.

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Re: RH-7695

Postby Blair » Thu Aug 08, 2013 4:05 pm

Looks fun! I like doing projects like this even more than crazy big projects. It reminds me how much simpler things can be:)
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Re: RH-7695

Postby Geek » Thu Aug 08, 2013 8:13 pm

Neat! :))
-= Gregg =-
Fine wine comes in glass bottles, not plastic sacks. Therefore the finer electrons are also found in glass bottles.
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Re: RH-7695

Postby TerrySmith » Fri Aug 09, 2013 10:56 am

One thing I forgot to mention is USE AN ISOLATION TRANSFORMER! Originally one side of the AC line is connected to the chassis and had a half wave selenium rectifier. Now it has a FWB rectifier so a transformer is a must. There is one used here but is off camera.
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