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Old 12th February 2013, 08:12 PM   #4801
pebmrb is offline pebmrb  United States
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Thanks for all the great compliments.
12B4A:
The cloth covering was applied with an adhesive I bought for copper veneer for another project.I looks like white Elmers glue,but seems a whole lot stronger.A wood veneer roller with heavy pressure worked the cloth into the adhesive nicely.
The two front grilles are aluminum,cut with a water jet.
Making brand new,shiny pieces of aluminum look ancient took aggressive dremel tool action and a hot bath in muratic acid.
The volume controls are cast iron handles from old water valves.Making these literally,valve amplifiers.
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Old 12th February 2013, 08:32 PM   #4802
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pebmbr: I absolutely love the look and the tubes are rare too. Has a slight Masonic feel about the amp. I very inspired. Excellent. Do you have a schematic?

Last edited by mhouston; 12th February 2013 at 08:35 PM.
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Old 13th February 2013, 11:26 AM   #4803
pebmrb is offline pebmrb  United States
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Thanks mhouston
I do have some regrets building with tubes so rare.I have minimal spares and prices are way too high for me,so I am considering modifying to accept 801a,10y,or EM20 for future repalcements.Unless someone here has some RS242s or RS241s laying around they would like to get rid of well below Epay prices?

schematic can be found here.Looking for constructive criticism on my first design
A few changes have been made since,but the schematic at the end is very close.If there is interest,bump the thread,I will comment on the updates.
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Old 13th February 2013, 11:46 AM   #4804
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Quote:
801a,10y,or EM20
They aren't that cheap or available either..
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Old 13th February 2013, 07:47 PM   #4805
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Quote:
Originally Posted by pebmrb View Post
Thanks mhouston
I do have some regrets building with tubes so rare.I have minimal spares and prices are way too high for me,so I am considering modifying to accept 801a,10y,or EM20 for future repalcements.Unless someone here has some RS242s or RS241s laying around they would like to get rid of well below Epay prices?

schematic can be found here.Looking for constructive criticism on my first design
A few changes have been made since,but the schematic at the end is very close.If there is interest,bump the thread,I will comment on the updates.
Most tubes have a good life in the thousands of hours. Even if you have only one spare pair you may get many years of play before you have to do something drastic. I built a 6N7 preamp and just ensured I have one spare pair around.
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Old 16th February 2013, 11:13 AM   #4806
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Default idle angle.

idle angle!
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Old 17th February 2013, 10:32 AM   #4807
fotios is offline fotios  Greece
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Default SET monoblocks.

A pair of super duper monoblocks into full covered aluminum chassis for safety reasons (kids in home). Very difficult construction because the restricted outer dimensions: 46cm depth X 23cm height X 29cm width. Chassis are designed to offer clear visibility of internal parts, for that reason the enormous ventilation holes especially in front panel. Single ended, no feedback and of course class A operation. Sincerely, the best sound i have ever heard! Low order harmonics are growing up gradually in a nice way and in accordance with the output power offering thus a nice sound coloration. Output tubes are a paralleled matched pair of TJ Full Music 300B with solid carbon plates so can be driven up to 20-21 Watt RMS without fear which means that amplifier is compatible with speakers even of 86-87dB SPL sensitivity. Input tube is a EF86 pentode which is buffered from output tubes thru a 5687 dual triode connected as cathode follower.
Attached Images
File Type: jpg DSC01368.jpg (479.9 KB, 812 views)
File Type: jpg DSC01364.jpg (543.6 KB, 754 views)
File Type: jpg DSC01370.jpg (726.3 KB, 703 views)
File Type: jpg DSC01366.jpg (690.8 KB, 659 views)
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Old 17th February 2013, 10:41 AM   #4808
hpeter is offline hpeter  Europe
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Quote:
Originally Posted by fotios View Post
Output tubes are a paralleled matched pair of TJ Full Music 300B with solid carbon plates
what max plate Watts?
have you been thinking about SV572-xx ?
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Old 17th February 2013, 10:45 AM   #4809
fotios is offline fotios  Greece
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Default SET monoblock B-part

Here pictures of chassis parts. Front and rear panels are made from 4mm aluminum while top and bottom cover from 2mm. Front and rear panels are processed with CNC laser while top and bottom covers with CNC punching machine. All made in Greece. In two pictures the chassis assembled off-hand.
Attached Images
File Type: jpg bottom2.jpg (299.2 KB, 155 views)
File Type: jpg cover4.jpg (385.6 KB, 39 views)
File Type: jpg front1.jpg (320.4 KB, 42 views)
File Type: jpg rear1.jpg (303.8 KB, 47 views)
File Type: jpg front5.jpg (659.4 KB, 52 views)
File Type: jpg rear7.jpg (647.9 KB, 50 views)
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Last edited by fotios; 17th February 2013 at 10:49 AM.
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Old 17th February 2013, 11:02 AM   #4810
fotios is offline fotios  Greece
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Default SET monoblock C-part

Here more pictures of chassis. In the first you can see the difficalty of assembly: the power and output transformers are mounted on a rised support plate because the lower space is needed for mounting of input RCA socket, output binding posts, IEC mains inlet and power switch.
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File Type: jpg DSC01338.jpg (551.7 KB, 91 views)
File Type: jpg DSC01340.jpg (691.6 KB, 171 views)
File Type: jpg DSC01339.jpg (624.2 KB, 147 views)
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