Re: Re: 6c45/2a3/6cj3
AFAIK it originated in a discussion on the Joe List. Jeremy Epstien had one of the 1st working examples. I don't remember whether Gorilla preceeded monkey or not, but in trying to understand what was being talked about i captured some maps.
http://www.t-linespeakers.org/tubes/gorilla.html
dave
rcavictim said:
AFAIK it originated in a discussion on the Joe List. Jeremy Epstien had one of the 1st working examples. I don't remember whether Gorilla preceeded monkey or not, but in trying to understand what was being talked about i captured some maps.
http://www.t-linespeakers.org/tubes/gorilla.html
dave
Re: Re: Re: 6c45/2a3/6cj3
In the schematics you posted the "Paul Joppa Parafeed" version is incorectly drawn and cannot work. The output transformer is hooked up to what is a cathode follower 2A3 with a 0D3 gas VR tubes shorting out the cathode modulation which hardly exists anyhow since the plate choke on the 2A3 gets the audio swing..
planet10 said:
In the schematics you posted the "Paul Joppa Parafeed" version is incorectly drawn and cannot work. The output transformer is hooked up to what is a cathode follower 2A3 with a 0D3 gas VR tubes shorting out the cathode modulation which hardly exists anyhow since the plate choke on the 2A3 gets the audio swing..
Re: Re: Re: Re: 6c45/2a3/6cj3
Could well be (i actually noted that that looked a bit funny when i found the URL -- that page has never been public)... i knew an awful lot less then than i do now, i'm still a rookie... the only one i cooresponded with to make sure i got it right was Kurt. If i get around to it i'll fix it.
dave
rcavictim said:
Could well be (i actually noted that that looked a bit funny when i found the URL -- that page has never been public)... i knew an awful lot less then than i do now, i'm still a rookie... the only one i cooresponded with to make sure i got it right was Kurt. If i get around to it i'll fix it.
dave
Re: gorilla
You could check the JoeList archives for the discussion... i'm sure the design was done a long time ago back in the days when the transistor was not yet a glimmer in the inventor's eyes.
here is Jeremy's http://home.earthlink.net/~jeremyepstein/freelunch.html
Welbournes DRD is another flavour as well IB.
dave
jsn said:Very cool. Do you know what the "original" monkey design was? That would be an interesting archaeological audio artifact
You could check the JoeList archives for the discussion... i'm sure the design was done a long time ago back in the days when the transistor was not yet a glimmer in the inventor's eyes.
here is Jeremy's http://home.earthlink.net/~jeremyepstein/freelunch.html
Welbournes DRD is another flavour as well IB.
dave
12e1 srpp parafeed
This one was inspired by Peter Millett's design using EL34s http://www.pmillett.addr.com/el34_active-load_(srpp)_amp.htm
I used 12e1s because they are cheap and a bit different. After lots of experimenting, I now have both 12e1s connected as triodes rather than the pentode / triode arrangement in Peter Millett's design. Drivers are 6sn7 also in srpp configuration.
Power supply is just straightforward parallel 5u4s then CLC with a tube regulated supply to the drivers.
I used Hammond 125E transformers again due to low cost and availability
The amp is now strating to sound nice but its taken ages to burn in (over a month) It sounded harsh and scratchy initially with very little bass.
Now starting to smooth out and the bass is actually really good for an se amp.
This one was inspired by Peter Millett's design using EL34s http://www.pmillett.addr.com/el34_active-load_(srpp)_amp.htm
I used 12e1s because they are cheap and a bit different. After lots of experimenting, I now have both 12e1s connected as triodes rather than the pentode / triode arrangement in Peter Millett's design. Drivers are 6sn7 also in srpp configuration.
Power supply is just straightforward parallel 5u4s then CLC with a tube regulated supply to the drivers.
I used Hammond 125E transformers again due to low cost and availability
The amp is now strating to sound nice but its taken ages to burn in (over a month) It sounded harsh and scratchy initially with very little bass.
Now starting to smooth out and the bass is actually really good for an se amp.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Congratulations on completing your project. By the look of your transformers I'm guessing that it sounds pretty good.
It's interesting that you mention the gainclone as in many ways, the ECL82 was the LM1875 of its era. Appearing in everything from low cost portable record players to the Telefunken S80 series amplifiers, it still compares favourably with its solid state 'competition'
It's interesting that you mention the gainclone as in many ways, the ECL82 was the LM1875 of its era. Appearing in everything from low cost portable record players to the Telefunken S80 series amplifiers, it still compares favourably with its solid state 'competition'
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Speaker project
I have build this speaker cabinets for audiofriend Doede. Doede is building the cross-over. You find more info on: www.dddac.de
Regards Guido
I have build this speaker cabinets for audiofriend Doede. Doede is building the cross-over. You find more info on: www.dddac.de
Regards Guido
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