• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

6550 SE design, please comment.

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#22
Bandersnatch said:
hey-Hey!!!,
Seems to me that if S1 is closed the secondary is shorted.
cheers,
Douglas
Click to expand...

Maybe my switch drawing ins't clear: it switches the cathode directly to ground or through the secondary 😉

The EL84 idea still appeals to me, especially when directly coupled. Don't know if a PS of about 370V will do..I'll study the curves again and while I'm at it try to grasp the idea of load.. I'm pretty sure I'll go for autobias btw.
 
#23
Miniwatt said:
Maybe my switch drawing ins't clear: it switches the cathode directly to ground or through the secondary 😉

The EL84 idea still appeals to me, especially when directly coupled. Don't know if a PS of about 370V will do..I'll study the curves again and while I'm at it try to grasp the idea of load.. I'm pretty sure I'll go for autobias btw.
Click to expand...

Well now that makes perfect sense...🙂 Just poor schematic reading skills on my part.
cheers,
Douglas
 
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