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Old 9th January 2012, 11:35 PM   #3841
Zen Mod is offline Zen Mod  Serbia
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under jeopardy that we are going to steal thread ( last one , I promise ! ) - please - make new FE for it ; and SS rectifiers , with brute force PSU

output stage is elegant , so it should stay ....
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Old 10th January 2012, 11:24 AM   #3842
stajo is offline stajo  Sweden
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Originally Posted by Zen Mod View Post
- please - make new FE for it ; and SS rectifiers , with brute force PSU

output stage is elegant , so it should stay ....
FE? What do you suggest?

/Staffan
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Old 10th January 2012, 02:44 PM   #3843
GloBug is offline GloBug  Canada
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Here is my amp. It's made from 2 salvaged and modified Magnavox AMP142/132s.
6CG7signal and paraphase inverter, 6V6 parallel push-pull, SS rectifier, 6HY PS choke, 1.5HY screen choke, 325 B+, 0.22uF couplers.
I removed some of the power caps you see in the picture. I also have it Triode strapped now, so I'm no longer using the screen choke and cap. I set them aside if I ever switch back to pentode mode.
I also removed those adhesive tie-downs, they slowly "slide" down/around over time with heat. I now have the caps secured mechanically.
I still have a few things I want to do, like individual cathode resistors, stick a LED in the vintage pilot light, maybe a cathode follower in the front end etc.
The "chassis", switches, IEC plug resistors and capacitors are new, the rest of the hardware was recycled. Even the fruitwood is from the original Magnavox console.

If there was a $200 buck amp challenge, this would be my entry.
I would take no less then $800 for it and would ask for a little more if I was to ever sell it.

Having said that I would put it up against any expensive tube amp of similar topology.
It is indeed a "sleeper", it's loud and hauntingly vivid sounding.
So any HKs or Marantz etc want a show down, it will be for pink slips.

It's been a fun project, and I would highly recommend it.

Thank you for your time.
Attached Images
File Type: jpg Mag1.JPG (144.6 KB, 1475 views)
File Type: jpg Mag2.JPG (176.9 KB, 1451 views)
File Type: jpg Mag3.JPG (247.7 KB, 1415 views)
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Old 10th January 2012, 05:14 PM   #3844
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by GloBug View Post
Here is my amp. It's made from 2 salvaged and modified Magnavox AMP142/132s.
6CG7signal and paraphase inverter, 6V6 parallel push-pull, SS rectifier, 6HY PS choke, 1.5HY screen choke, 325 B+, 0.22uF couplers.
I removed some of the power caps you see in the picture. I also have it Triode strapped now, so I'm no longer using the screen choke and cap. I set them aside if I ever switch back to pentode mode.
I also removed those adhesive tie-downs, they slowly "slide" down/around over time with heat. I now have the caps secured mechanically.
I still have a few things I want to do, like individual cathode resistors, stick a LED in the vintage pilot light, maybe a cathode follower in the front end etc.
The "chassis", switches, IEC plug resistors and capacitors are new, the rest of the hardware was recycled. Even the fruitwood is from the original Magnavox console.

If there was a $200 buck amp challenge, this would be my entry.
I would take no less then $800 for it and would ask for a little more if I was to ever sell it.

Having said that I would put it up against any expensive tube amp of similar topology.
It is indeed a "sleeper", it's loud and hauntingly vivid sounding.
So any HKs or Marantz etc want a show down, it will be for pink slips.

It's been a fun project, and I would highly recommend it.

Thank you for your time.
Very nice...

I know what you mean recycling parts...I built a fender champ from recycled parts..It feels good..

Also I don't think you can get the same sound with modern parts OP Tx's and such just have a sound all of their own..(The smell helps as well)..LOL

Regards
M. Gregg
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Old 10th January 2012, 06:24 PM   #3845
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Very nice work. Always nice to keep those vintage parts working too. How much of what is sold today will still be going strong in 50 to 60 years?
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Old 11th January 2012, 03:46 PM   #3846
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Originally Posted by jonusgrumby View Post
Very nice work. Always nice to keep those vintage parts working too. How much of what is sold today will still be going strong in 50 to 60 years?
Probably nothing ... :-(
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Old 13th January 2012, 10:13 PM   #3847
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Default My first real DIY build, from RH84 schematic

Build this amplifier last week! The dimensions of many pre fabricated cabinets are not of my liking, so I decided to build one myself.
It's a stereo single ended EL84 design using 'schade feedback'. It's build exactly according to Aleksandar Kitic's RH84 schematic.
It uses a JJ 5U4GB rectifier and a JJ ECC81 as driver. The power transformer is wound to my specification by 'AE Europe' in Schagen, Holland.
Output transformers (AT06) are from HB Amp Design in Germany. The parts are all ordered,
except the EL84's (Haltron, made by Tungsram factory) I had those lying around... mostly the reason I build this.
It sounds great! The lower frequencies are represented very well, and the mids and highs are very detailed, great schematic.
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Old 15th January 2012, 10:32 PM   #3848
M Gregg is offline M Gregg  United Kingdom
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This is an old build..
Just thought I would put it in here before it gets lost in the sands of time..


SE EL34...



Regards
M. Gregg
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File Type: jpg DSCN3387a.JPG (37.6 KB, 441 views)
File Type: jpg DSCN3388a.JPG (40.3 KB, 475 views)
File Type: jpg DSCN3374a.JPG (36.5 KB, 495 views)
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Old 15th January 2012, 10:34 PM   #3849
M Gregg is offline M Gregg  United Kingdom
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Missed the base..LOL


Regards
M. Gregg
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Old 15th January 2012, 10:40 PM   #3850
GloBug is offline GloBug  Canada
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Looks good!, Is that a copper shielding in there?
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