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   Home » Melquiades Amplifier » Melq 6e5p driver stage for ss? (30 posts, 2 pages)
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11-04-2016 Post does not mapped to Knowledge Tree
lampes
Posts 3
Joined on 11-05-2016

Post #: 26
Post ID: 22832
Reply to: 21587
6e5p SRPP bias
fiogf49gjkf0d
Hi to everyone

years of reading but never subscribe and post to forum

I see that Zarathustra circuit and i m very interested on the first SRPP stage
Can someone point out how to implement Melq Gas Bias on that SRPP circuit?
I would like to implement a line lever preamp with low output impedance use that tube

Thanks in advance

Thanos

11-15-2016 Post does not mapped to Knowledge Tree
shannon
Posts 22
Joined on 08-08-2014

Post #: 27
Post ID: 22849
Reply to: 22832
Not really possible
fiogf49gjkf0d
thee srp in Zarathustra is cathode bias, melq is grid bias.  If gas biased the srpp it would no longer be the circuit in zarathustra. what would this do to sound i have no idea.  The function of the gas tubes in melq are not only for providing bias.  Most importantly they absorb garbage and shape the sound. They need to be in the location and circuit to do what they do.
But if you wanted to do what you are thinking.  The back to back reveresed gas tubes output  the few volts of bias needed. so say one is 149v one 151v you get 2 volts.  so the 270ohm cathode resistor in zarithustra would be some how replaced with that few volts.  Not sure if this is possible or correct I never experimented with srpp.  I'm sure someone on that russian forum could tell you exactly how to do it. they may have already did it.
Why not try ,did myself, single ended gassed 6e5p like in melq for preamp.  It can work but nothing interesting to me.
  
11-17-2016 Post does not mapped to Knowledge Tree
lampes
Posts 3
Joined on 11-05-2016

Post #: 28
Post ID: 22852
Reply to: 22849
Gas Bias SRPP 6e5p
fiogf49gjkf0d
Hi Shannon

I think that Romy have it already on his pre-assembled Zarathustra on this topic's pictures:

http://www.goodsoundclub.com/Forums/ShowPost.aspx?PageIndex=1&postID=4121#4121

and also here:

on post #8
http://www.goodsoundclub.com/Forums/ShowPost.aspx?PageIndex=1&postID=1029#1029


As you see there are two 6e5p and two Reg tubes on the circuits


If Romy likes to share will be good


Thanks



11-17-2016 Post does not mapped to Knowledge Tree
shannon
Posts 22
Joined on 08-08-2014

Post #: 29
Post ID: 22853
Reply to: 22852
Yes
fiogf49gjkf0d
I Forgot they did this.  I only have experience with se driver stage. You would remove r3 and c1. change r2 to 10k and put the bias voltage from the gas tubes across it. 
I would try just regualar zaruthstra srpp circuit first.  Like do you know it will benifit your playback?  Dima said difference from regular to gassed is small. It is lot's of expensive parts to experiment.  Unless you have the transformers and chokes and sockets and high power resistors and gas tubes all just sitting there.



11-24-2016 Post does not mapped to Knowledge Tree
lampes
Posts 3
Joined on 11-05-2016

Post #: 30
Post ID: 22864
Reply to: 22853
Gas Bias SRPP
fiogf49gjkf0d
Hi Shannon and thanks for the answer
I guess i have to try it when i m able to build it


Regards
Tom
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