Thanks, you have me intrigued. I don't need details, I was just wondering about the kinds of things you designed into this amp. Nicely done!
Hi,
this is a stereo push-pull amplifier built in a cheese box.
The top plate was made by Schaeffer in Germany.
Tubes are 4 x EL84 and 2 x 6AN8.
The main goal of this exercise was the use of 100V transformers as output transformers.
Despite the small 100V output transformers, the amp is powerfull and the sound is not bad at all.
I was inspired by an old posting on the internet:
http://home.alphalink.com.au/~cambie/6AN8amp/6an8amp.htm
Best regards, Frans.
I like how you left the handles on the cheesebox.
Hi,
this is a stereo push-pull amplifier built in a cheese box.
The top plate was made by Schaeffer in Germany.
Tubes are 4 x EL84 and 2 x 6AN8.
The main goal of this exercise was the use of 100V transformers as output transformers.
Despite the small 100V output transformers, the amp is powerfull and the sound is not bad at all.
I was inspired by an old posting on the internet:
http://home.alphalink.com.au/~cambie/6AN8amp/6an8amp.htm
Best regards, Frans.
Very cheesy - But in a good way!
My recently completed TubeLab SSE and Aikido Pre-Amplifier:
Thanks,
Bibin
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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.
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.
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.
Thanks,
Bibin
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Lots of nice stuff out there. Nice thread to browse through.
Here are some pictures of the SET amp that I built from a basic kit offered by a diyaudio forum member several years ago.
http://www.diyaudio.com/forums/vendors-bazaar/180897-kt88-se-basic-master-kit.html#post2428752
I like the natural beauty of wood, so I built my own case from oak and cherry, with an aluminum top plate.
KT88, 6550, or EL34 can be used. My preference is 6550 Winged C. Output transformers have 4-ohm, 8-ohm, and 16-ohm taps (not from original kit). Output is around 6-8W in triode mode, and probably 11-13W in ultra-linear.
I've replaced the ALPS pot with a Khozmo 48-step attenuator. The shrouds around the hand holds were made from a PA speaker handle recess.
I've really enjoyed it over the years.
Here are some pictures of the SET amp that I built from a basic kit offered by a diyaudio forum member several years ago.
http://www.diyaudio.com/forums/vendors-bazaar/180897-kt88-se-basic-master-kit.html#post2428752
I like the natural beauty of wood, so I built my own case from oak and cherry, with an aluminum top plate.
KT88, 6550, or EL34 can be used. My preference is 6550 Winged C. Output transformers have 4-ohm, 8-ohm, and 16-ohm taps (not from original kit). Output is around 6-8W in triode mode, and probably 11-13W in ultra-linear.
I've replaced the ALPS pot with a Khozmo 48-step attenuator. The shrouds around the hand holds were made from a PA speaker handle recess.
I've really enjoyed it over the years.
Attachments
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Thank you Zman
Thank you. It sounds really awesome especially the mids. There is no hum or noise.
Thank you Navin
Thank you Dave
Regards,
Bibin
Lots of nice stuff out there. Nice thread to browse through.
Here are some pictures of the SET amp that I built from a basic kit offered by a diyaudio forum member several years ago.
http://www.diyaudio.com/forums/vendors-bazaar/180897-kt88-se-basic-master-kit.html#post2428752
I like the natural beauty of wood, so I built my own case from oak and cherry, with an aluminum top plate.
KT88, 6550, or EL34 can be used. My preference is 6550 Winged C. Output transformers have 4-ohm, 8-ohm, and 16-ohm taps (not from original kit). Output is around 6-8W in triode mode, and probably 11-13W in ultra-linear.
I've replaced the ALPS pot with a Khozmo 48-step attenuator. The shrouds around the hand holds were made from a PA speaker handle recess.
I've really enjoyed it over the years.
Hi Dave,
Nice Work, I am also in the process of build another TubeLab SSE in a wooden enclosure. Will share the images here.
Regards,
Bibin
Thanks. Actually, the volume and power buttons are still in the same place. The wiring pictures were taken from opposite sides of the chassis.
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Toccata 417a/6GK5/5842 Phono Stage
This is a well known design originally by Arthur Loesch and updated by Thorsten Loesch. Details of Thorsten’s version and build here.
I have more or less followed the design but decided it would be interesting to give each stage its own diecast box to improve screening and reduce potential interactions between the different amplifier stages. I used matched 2SK170s rather than the 2SK147 in the schematic due to availability.
Sounds really good so-far with my Linn Krystal. Very quiet, good at resolving fine detail and able to carry a tune. I had none of the reported oscillation issues with the 417a so cutting off spare grid connections on the valve socket and using ferrite beads seems to have worked.
This is a well known design originally by Arthur Loesch and updated by Thorsten Loesch. Details of Thorsten’s version and build here.
I have more or less followed the design but decided it would be interesting to give each stage its own diecast box to improve screening and reduce potential interactions between the different amplifier stages. I used matched 2SK170s rather than the 2SK147 in the schematic due to availability.
Sounds really good so-far with my Linn Krystal. Very quiet, good at resolving fine detail and able to carry a tune. I had none of the reported oscillation issues with the 417a so cutting off spare grid connections on the valve socket and using ferrite beads seems to have worked.
Attachments
I posted my latest valve circuit here:
http://www.diyaudio.com/forums/digital-line-level/166807-dac-gallery-24.html#post5065812
because it is not an amplifier.
http://www.diyaudio.com/forums/digital-line-level/166807-dac-gallery-24.html#post5065812
because it is not an amplifier.
Futterman OTL
I have just completed a new Futterman build. I more of less stuck to the schematic attached, but replaced the cold cathode voltage reference tubes with 5w Zenerdiodes. They start regulating at around the same current flow as the reference tubes and they are much easier to fit.
It uses 4 6gy5 tubes pr. channel - and delivers around 20 W into 8 ohms. I have experimented a little with the bias setting. Originally Futterman ran his output tubes up to something like 70-80% of their capability, which is very hard on the tubes. I run them at around 50mA pr. tube - and can't detect any downsides to this. The THD is still around 0.1% and sonically I can't detect differences either.
I mostly used off the shelf toroidal transformers, but added an extra 150Vac winding for the screen grid voltage and a 30Vac winding for the bias (I use a voltage doppler). The heather transformer in below deck - the B+ on top.
The amplifier is built on the remains of a Technics integrated amplifier I butchered some time ago.
In the bottom there is a slow moving fan which keeps the whole thing quite cool.
I have just completed a new Futterman build. I more of less stuck to the schematic attached, but replaced the cold cathode voltage reference tubes with 5w Zenerdiodes. They start regulating at around the same current flow as the reference tubes and they are much easier to fit.
It uses 4 6gy5 tubes pr. channel - and delivers around 20 W into 8 ohms. I have experimented a little with the bias setting. Originally Futterman ran his output tubes up to something like 70-80% of their capability, which is very hard on the tubes. I run them at around 50mA pr. tube - and can't detect any downsides to this. The THD is still around 0.1% and sonically I can't detect differences either.
I mostly used off the shelf toroidal transformers, but added an extra 150Vac winding for the screen grid voltage and a 30Vac winding for the bias (I use a voltage doppler). The heather transformer in below deck - the B+ on top.
The amplifier is built on the remains of a Technics integrated amplifier I butchered some time ago.
In the bottom there is a slow moving fan which keeps the whole thing quite cool.
