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Old 8th June 2013, 07:42 AM   #5181
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by mhouston View Post
This amp is my new EL34 the "retro-34UL", Signature EL34 amp.

Top plate is ABS plastic and base Australian Spotted Gum (oiled). Feet are filled with lead sinkers and rubber glue, silver solder and and silver plated wire used throughout. Topology is Single-end Ultra-linear.
Do you have a shot of the inside? Just for interest of course
How have you supported the ABS?

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M. Gregg
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Old 8th June 2013, 08:49 AM   #5182
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Originally Posted by M Gregg View Post
Do you have a shot of the inside? Just for interest of course
How have you supported the ABS?

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M. Gregg
The schematic is freely available. Have you heard of a birds nest? Mine is more like a vultures nest! Yes I'll post a image. No support for the top. It doesn't appear to be sagging the plate is very thick.

Last edited by mhouston; 8th June 2013 at 08:52 AM.
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Old 8th June 2013, 09:37 AM   #5183
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Here's my everyday amp:

Click the image to open in full size.

It's a KT120 single ended ultralinear amplifier.
Input tubes are old British WW2, Cossor, 41MTL meshplate triodes.
PSU is a simple CLCLC.
Output transformers are James.
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Old 8th June 2013, 10:03 AM   #5184
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by Steve Cresswell View Post
Here's my everyday amp:

It's a KT120 single ended ultralinear amplifier.
Input tubes are old British WW2, Cossor, 41MTL meshplate triodes.
PSU is a simple CLCLC.
Output transformers are James.
Shame you don't have a YouTube link of it playing..

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Old 8th June 2013, 12:33 PM   #5185
wlowes is online now wlowes  Canada
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Originally Posted by M Gregg View Post
What are the 8 Tx's for.. are they interstage or heater? Interesting heat isolation for the 6C33C's.

What kind of power out are you getting?

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M. Gregg
It is capacitor coupled. Russian PIO bypassed with Russian silver mica.

The row of Hammond iron is mostly chokes. There are 3 chokes showing on each mono with one down below. Also used separate transformers for everything. The B+ has one 5A torrid for +, another below for -. Way more than needed but I think contributes to very fast clean presentation. Separate toroids for every 2 6c33c filament. separate EIs for bias, small tube B+ and filaments.
Total of 8 chokes and 14 PT in the power supply. A bit of a lift! The heat isolation works very well. The long vent between the row of tubes and the row of chokes truncates the heat at that point. Metal around tubes acts like heat sink but you can hold your finger right on the metal behind the vent. Good chimney effect keeps everything cool.

Not measured but designed for 110w per side results in very tight detailed bass.

Last edited by wlowes; 8th June 2013 at 12:39 PM.
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Old 8th June 2013, 02:55 PM   #5186
Cassiel is offline Cassiel  Libya
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Originally Posted by mhouston View Post
It doesn't appear to be sagging the plate is very thick.
Wow, I like the look of that top plate. As usual I dislike Edcor's blue but the rest looks top notch. BTW, I really LOVE my SE UL amp. It has the Life and Vitality of a teenager. Electrifying fast. The instruments jump at you. Really amazing.
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Old 8th June 2013, 03:01 PM   #5187
thanong is offline thanong  United States
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Quote:
Originally Posted by Steve Cresswell View Post
Here's my everyday amp:

Click the image to open in full size.

It's a KT120 single ended ultralinear amplifier.
Input tubes are old British WW2, Cossor, 41MTL meshplate triodes.
PSU is a simple CLCLC.
Output transformers are James.
Hi Steve,I very love that light green amp.Its make me think of BSA or Norton Motorcycle.I voted for top ten Single End for your amp.Can your share more detail please(circuit and how you made it),Thanks.
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Old 8th June 2013, 03:11 PM   #5188
thanong is offline thanong  United States
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This amp is my new EL34 the "retro-34UL", Signature EL34 amp. On early listening the amp sounds fast, crisp and SS like. A very natural sounding amp. Valve compliment is NOS Svetlana EL34 and Svetlana 6N1P. Edcor GXSE 6omh ultra-linear OPTs and 10H choke and power tranni are Hammond. Inter-stage caps are Jensen copper, paper and oil with pure silver leads. Biploar caps are used as bypass caps on the EL34s with ceramic sockets for the audio tubes. Rectifier valve is a Golden Dragon 5U4. OPTs are rubber mounted.

Top plate is ABS plastic and base Australian Spotted Gum (oiled). Feet are filled with lead sinkers and rubber glue, silver solder and and silver plated wire used throughout. Topology is Single-end Ultra-linear.
mhouston,first and only thing I can say is "Wow" You always made awesome item.Thanks for sharing and hope to see your next project.
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Old 8th June 2013, 03:12 PM   #5189
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Here is an image of the underside. Not pretty but functional
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File Type: jpg Underside.jpg (227.6 KB, 916 views)
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Old 8th June 2013, 04:04 PM   #5190
thanong is offline thanong  United States
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Here is an image of the underside. Not pretty but functional
haha...cool enough,easy to follow.I wish I would have one.
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