Photo Gallery

[pebmrb]

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.

[mhouston]

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?

[pebmrb]

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.

[Bas Horneman]

801a,10y,or EM20

They aren't that cheap or available either..

[mhouston]

Originally Posted by pebmrb

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.

[vietdung]

idle angle!

[fotios]

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.

[hpeter]

Originally Posted by fotios

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 ?

[fotios]

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.

[fotios]

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.