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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 18 Apr 2021, 16:06

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PostPosted: 20 Jan 2021, 17:33 
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Joined: 05 Feb 2018, 11:49
Posts: 18
Perhaps you anticipated this being an EE, but thought I'd mention in case it's helptul.

The B+ voltage will be lower using a tube rectifier, but should still be in a good operating range for 6DJ8 tubes. If you want to increase the B+ voltage, lower the value of one or both resistors R1 until it's where you want it (maybe try 330 Ω). You can compensate for the decrease in ripple filtering by increasing the size of each capacitor C2 that follows.

Even better, use a lower resistance choke in place of one or both resistors R1. I did so in order to increase the B+ over 200V so I could use 6CG7s (typo on the choke value there; they are 0.45H or about one half Henry each): viewtopic.php?p=54046#p54046

Good luck, it's a fun project and great amp!


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PostPosted: 20 Jan 2021, 20:59 
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Joined: 04 Jun 2008, 20:59
Posts: 4343
Location: Arizona, USA
Hi, Tube rectifiers are fine. The biggest issue with 6DJ8s is getting too much voltage. I have not tried it, but I suspect that the amp will work quite well with anode voltages down to about 75 volts. There would be a slight reduction in output power....but it will be way more than most phones need.

Good listening
Bruce

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