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Old 19th Aug 2019, 5:54 pm   #17
turretslug
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Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,385
Default Re: AR88 - New keeper

Just realised something I should have mentioned earlier- as standard, the AR88 was fitted with a 5Y3GT rectifier, your set looks as though it has something like a 5T4 or possibly a 5Z4 fitted. It's not at all unusual to find one of the various other 5V heater International Octal base rectifier family fitted to AR88s- they have differing heater currents and forward voltage drops between types but will generally basically "work" in the AR88 with its relatively modest HT current requirements. Note however that the steel envelope types could possibly become painfully live in the event of an internal fault- the envelope is connected to pin 1 of the base but this is left floating and not connected to chassis in the AR88 as it was designed around the glass envelope 5Y3GT.
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