My 807 Clementine begins
Posted: Mon Nov 07, 2011 2:27 pmdiytube.com
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My 807 Clementine begins
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Posted: Mon Nov 07, 2011 2:27 pmPosted: Mon Dec 12, 2011 2:59 pmGot more on this project?
Posted: Mon Dec 12, 2011 4:24 pmNothing yet. I have been busy. I asked a couple of questions in another thread, but got no answers. I will probably get around to working on it over the next couple of days.
Al
Al
Posted: Mon Dec 12, 2011 7:04 pmThanks for the update! Just happen to have a bunch of 807s and been waiting for someone to break the ice with a 807 Clementine! 
1625/12SL7 Clementine
Posted: Mon Dec 12, 2011 8:05 pmAl,
I'm also building a Clementine amp based on the 807/1625 tube family. I have a whole bunch of these tubes just waiting for a good amp project. It should be completed in the next week or two. Hoping to be done before the holidays.
I'm using Edcor GXSE15-8-5k as the output and Edcor XPWR114-120 as the power transformer. I'm using this particular PT because of the 12 volt filament. The 1625 is a 12 volt version of the 807. The front end tube will be a 12SL7. Tube rectification will be with a 5AR4 or GZ-37.
The output will be ultralinear single-ended with 6 db of global feedback. My prototype yielded ~9 watts in this configuration. Very similar to what Shannon got with his 6L6 version.
JT
I'm also building a Clementine amp based on the 807/1625 tube family. I have a whole bunch of these tubes just waiting for a good amp project. It should be completed in the next week or two. Hoping to be done before the holidays.
I'm using Edcor GXSE15-8-5k as the output and Edcor XPWR114-120 as the power transformer. I'm using this particular PT because of the 12 volt filament. The 1625 is a 12 volt version of the 807. The front end tube will be a 12SL7. Tube rectification will be with a 5AR4 or GZ-37.
The output will be ultralinear single-ended with 6 db of global feedback. My prototype yielded ~9 watts in this configuration. Very similar to what Shannon got with his 6L6 version.
JT
Posted: Mon Dec 12, 2011 8:27 pmThat sounds like a cool project. I look forward to seeing your progress.
Al
Al
Posted: Mon Dec 12, 2011 8:31 pmSince this thread seems to be getting more traffic, perhaps I should ask my question here. How are pentode and triode configurations made on the Clemintine board?
Thanks,
Al
Thanks,
Al
Posted: Mon Dec 12, 2011 10:02 pmAl Wrote:
For triode mode, you would just put in 100 ohm resistors on the board for R15 and R16. This straps the screen to the plate.
I wouldn't recommend pentode mode for this amp. To do this, you will need to supply some dc voltage to the screen. I don't think Shannon intended this as an option.
Ultralinear mode is a good choice if you have screen taps on the output transformer.
In my project, I am using chassis mount ceramic sockets for the 1625 tubes that are mounted behind the board. The plate cap will be soldered directly to the lead from the output trannie, and the screen tap will be soldered to the tube socket. The other connections (grid, cathode, and filaments) will come from the octal socket holes on the board.
JT
How are pentode and triode configurations made on the Clemintine board?
For triode mode, you would just put in 100 ohm resistors on the board for R15 and R16. This straps the screen to the plate.
I wouldn't recommend pentode mode for this amp. To do this, you will need to supply some dc voltage to the screen. I don't think Shannon intended this as an option.
Ultralinear mode is a good choice if you have screen taps on the output transformer.
In my project, I am using chassis mount ceramic sockets for the 1625 tubes that are mounted behind the board. The plate cap will be soldered directly to the lead from the output trannie, and the screen tap will be soldered to the tube socket. The other connections (grid, cathode, and filaments) will come from the octal socket holes on the board.
JT
Posted: Tue Dec 13, 2011 1:10 amI wondered because I happened to have a spare set of X-formers and a bunch of 807 (Russian).
Posted: Sun Jan 29, 2012 9:11 pmFinished this amp a few weeks ago. I like the way it sounds. I need to take some pics. How does one upload pictures on this site?
Al
Al
Posted: Mon Jan 30, 2012 5:39 amapurcell22 wrote:Finished this amp a few weeks ago. I like the way it sounds. I need to take some pics. How does one upload pictures on this site?
Al
'
Al, you can upload them to Flickr, or you can just email them to me and I'll upload them to the website.
Shannon
Posted: Mon Jan 30, 2012 9:53 pmHere is a pic of the completed amp.
Posted: Tue Jan 31, 2012 9:44 amReally nice chassis ! Any guts shots ?
Posted: Tue Jan 31, 2012 12:53 pmI will snap a couple of shots later today, and see if I can figure out flicker. Don't want to keep bugging Shannon.
Al
Al
Posted: Tue Jan 31, 2012 1:09 pmVery Nice!
Listening impressions?
Listening impressions?