Simple IT PP

[James D.]

oops, I thought your buddies would be building it themselves.

Your right they will... but under my instruction as they are not experienced with tubes but are used to sand based equipment - they don't know what they are getting into

There was a lot of mickey taking going on until they heard my systems... They thought they were proper engineers until they met me... now they know that they are proper engineers....but the world isn't a proper world

ciao

James

[Brett]

Hi James,

I was just wondering whether you've found any measurable differences between using the zener/cap stack and a simple resistor betweem the plate and g2 on the 807's? And what are the audible differences?

I'm all out of zeners here (and <i>all</i> my parts are mail ordered) so I'll try this set-up on my little EL84 triode PP amps when I put in the next order. This technique is something I've known about for some time, but have yet to try.

[James D.]

Hi Brett,

I haven't measured this difference. I will when I get a chance...

When I tried it I prefered the zenar connection - it was cleaner sounding and nice and relaxed. It was also faster when required to be. These are characteristics I associate with very low distortion - so I guess it should measure better too. The difference was as I expected so I didn't bother to measure it...

I have been told that this is most effective for tetrodes and pentodes that were not designed for triode operation - so maybe there is less difference for EL84s,34s or I guess 807s....

ciao

James