I used my old cell phone's case it came in , i its crazy but you'll find the darndest things to put an amp in , it works well , and looks good i think ? .
I used 6cg7 as the inputs and 6922 as the outputs.
No, i got the original "broski" pcb, not that i'm affiliated , and or promote his boards over others , in fact i sent him several email afterwards asking some basic pointers and got no reply , but i suppose thats why its called DIY , but he did send the pcm fast considering im on tha other side of the world.
Oh and the monitors are Fostex PM2 , they sound fantastic as they are , but with the preamp the music takes on a new character (smooth , sweet, detailed, yet fast and dynamic) ... i did have slight hum at first but sorted that by biasing the heater Ct (ac heaters), im just experimenting with a few output caps, to increase the bass a touch , it probably rolls off at around 80-100hz (becaue of the ipod) , but a 1uf should fix that , i would like it to start at around 30hz.
I used 6cg7 as the inputs and 6922 as the outputs.
No, i got the original "broski" pcb, not that i'm affiliated , and or promote his boards over others , in fact i sent him several email afterwards asking some basic pointers and got no reply , but i suppose thats why its called DIY , but he did send the pcm fast considering im on tha other side of the world.
Oh and the monitors are Fostex PM2 , they sound fantastic as they are , but with the preamp the music takes on a new character (smooth , sweet, detailed, yet fast and dynamic) ... i did have slight hum at first but sorted that by biasing the heater Ct (ac heaters), im just experimenting with a few output caps, to increase the bass a touch , it probably rolls off at around 80-100hz (becaue of the ipod) , but a 1uf should fix that , i would like it to start at around 30hz.
An externally hosted image should be here but it was not working when we last tested it.
I have split off the discussion on the Metronome Speaker.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=85410
dave
http://www.diyaudio.com/forums/showthread.php?s=&threadid=85410
dave
Mr. Triatic said:my last creation, a Single End amplifier with EL84;
Looks good. What did you use for xfmer covers? Don`t like valve rectification? That could`ve made the tube count 25% more visually impressive.
I bought the molded plastic x-fomer covers at www.roehrentechnik.de where i also bought the transformers, i chose not to use a tuberectifier because of the powertransformers lack of windings for that purpose, i opted for solid state rectification with fast diodes and a lot of powersupplycaps.What did you use for xfmer covers? Don`t like valve rectification?
Minimalistic outside, but surely not inside
Attachments
Just a little "how-NOT-to" from my second project. This just looks too dangerous, so I HAD to take a picture
This is a stereo KT88 SE amp, built from Mikael Abdellah's schematics, waiting for its chassis. I'm using a very old Telefunken ECC85 in it right now, and I think I like it more than the 6N1P so far. The PSU is all MKP motor run caps and will be on a separate chassis due to the size (the largest transformer in the picture is not used, BTW). James OTs, Jensen copper coupling caps etc. etc.
This is a stereo KT88 SE amp, built from Mikael Abdellah's schematics, waiting for its chassis. I'm using a very old Telefunken ECC85 in it right now, and I think I like it more than the 6N1P so far. The PSU is all MKP motor run caps and will be on a separate chassis due to the size (the largest transformer in the picture is not used, BTW). James OTs, Jensen copper coupling caps etc. etc.
Attachments
showdown said:I'm using a very old Telefunken ECC85 in it right now, and I think I like it more than the 6N1P
Do you have some detail on that... i have quite a few ECC85 in my junk box, including a whack of TFK.
dave
I'll admit I don't know much about this, I just know the pinout is the same... I checked the max. ratings and popped it in without any modifications. Sounds pretty good to my ears.planet10 said:
Do you have some detail on that... i have quite a few ECC85 in my junk box, including a whack of TFK.
I've seen audio amps using ECC85, but not many. Mine came from an old radio.
--
Rolf
Se3x6550
Single ended triode/ultra linear mono amplifiers based on 3 x 6550 power tubes. Low distortion, medium power, shunt feedback design.
At the work bench:
Night view:
Some key figures:
- Single ended, no global feedback.
- Bandwidth (Po=10W): Triode: <10Hz-70kHz (-3dB), UL: <10Hz-75kHz (-3dB)
- Max power output rms: Triode: 24W, UL: 45W
- Distortion (Po=10W): Triode: 0.6%, UL: 0.3%
- Damping factor: Triode: 6.9, UL: 5.3
Distortion pattern 400Hz sine, Po=10W
Square wave 10kHz, Po=10W
Custom made transformers and chokes by Sowter.
Jan E Veiset
NO-6600
Single ended triode/ultra linear mono amplifiers based on 3 x 6550 power tubes. Low distortion, medium power, shunt feedback design.
At the work bench:
An externally hosted image should be here but it was not working when we last tested it.
Night view:
An externally hosted image should be here but it was not working when we last tested it.
Some key figures:
- Single ended, no global feedback.
- Bandwidth (Po=10W): Triode: <10Hz-70kHz (-3dB), UL: <10Hz-75kHz (-3dB)
- Max power output rms: Triode: 24W, UL: 45W
- Distortion (Po=10W): Triode: 0.6%, UL: 0.3%
- Damping factor: Triode: 6.9, UL: 5.3
Distortion pattern 400Hz sine, Po=10W
An externally hosted image should be here but it was not working when we last tested it.
Square wave 10kHz, Po=10W
An externally hosted image should be here but it was not working when we last tested it.
Custom made transformers and chokes by Sowter.
Jan E Veiset
NO-6600
showdown said:I've seen audio amps using ECC85, but not many. Mine came from an old radio.
ECC85 is usually seen as the 1st stages of an FM receiver.
dave
My Hybrid
Well, i have finally finished my hybrid ( http://www.diyaudio.com/forums/showthread.php?threadid=78576 ), now i only need to get a decent PSU for it.
The enclosure is from a 3,5" HDD to USB externall case.
Well, i have finally finished my hybrid ( http://www.diyaudio.com/forums/showthread.php?threadid=78576 ), now i only need to get a decent PSU for it.
The enclosure is from a 3,5" HDD to USB externall case.
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.
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.
Just another amp..
Designed and made some nice woodwork around an ancient Howard dialplate (escutcheon) in Art-Deco style..
Love it or not...
Kees
An externally hosted image should be here but it was not working when we last tested it.
Designed and made some nice woodwork around an ancient Howard dialplate (escutcheon) in Art-Deco style..
Love it or not...
Kees
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