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Thanks Guys!

Thanks for the clarification guys!

My query stems from a thread on another site: http://www.diyaudio.com/forums/instruments-amps/5246-el84-substitute-7189a-2.html

The poster is trying to rebuild a Japanese Teisco Express 5 guitar amp. After viewing a schematic he posted of a Teisco 10 (which seems to be the same amp) and other pics of his amp, I looked at some schematics of similar amps (Kalamazoo Models 1 and 2 and a Silvertone 1421) and noticed a similar use of the 6X4. While I don't own any of these amps, I hadn't ever seen the 6X4 - or any other rectifier tube for that matter - used like this.

If you read the thread you'll see that my main concerns were the use of a 40uF first cap in the PS (the data sheet calls for 10uF) and the owner's seeming reluctance to replace the infamous grey oil caps that the Japanese were so fond of using.

Edits: 04/17/17

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