• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Tony's TABOR amp clone wannabe build log.....

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#141
GUNFU said:
This amplifier is difficult to repeat to radio amateurs. In his winding, he used a wire in Kel-F ( TECAFLON,Teflon-3) insulation and rather thick insulation. I've never seen such on sale. Although I was told at the plant that they can make a special double-sealed enamel wire plus Teflon-4 insulation by special order. Apparently, Bereskin in 1958 had a rich and ambitious customer.
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thanks, i have decided that i am not going to make any tube amp of this magnitude and scale.....
 
#142
today's' update: input XLR and output binding posts installed...
cathode resistors in place under the pcs and in mounting brackets...
 

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#146
GUNFU said:
Tony, the cover is good. Did you do it yourself? The coloring of the color is also good, not glamorous.
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you mean chassis? yes, i made it from 1.5mm thick aluminum sheets
and bent using box benders in a local shop...
all holes were drilled by me using combination of drill bits,
hole saws and step drill bits....
powder coating light textured grey finish...
flap sand paper wheels attached to a baby grinder was
used to remove burs and rough edges from the drilling
and hole cutting....
 

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#152
GUNFU said:
Tony, I'm not talking about the sockets (base) or replace the tube with analogs. How to adjust the depth of local feedback in this driver?
Do you make your own amplifier in this or similar diagram?
http://www.diyaudio.com/forums/atta...-tonys-tabor-amp-clone-build-log-img_0028.gif
Click to expand...

As I pointed out before this design has almost 100% local feedback around the finals and there is no straightforward method of reducing this. Something along the lines of the Baby Huey might be adapted - but the Huey uses triode drivers so the ratios would be very different.

Shoog
 
#154
Shoog said:
As I pointed out before this design has almost 100% local feedback around the finals and there is no straightforward method of reducing this. Something along the lines of the Baby Huey might be adapted - but the Huey uses triode drivers so the ratios would be very different.
Shoog
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From my practice, I know that you can always find a way out of any difficult situation. For example, one of the simple options, you can put another resistor in parallel with the driver as a divider.
 
#156
Shoog said:
As I pointed out before this design has almost 100% local feedback around the finals and there is no straightforward method of reducing this. Something along the lines of the Baby Huey might be adapted - but the Huey uses triode drivers so the ratios would be very different.

Shoog
Click to expand...

reason why no global negative feedback was needed and applied.
i have done such an arrangement with 8 kt88 in push-pull triode wired,
i made provisions for gnfb connections but listening to the finished amp
found no need for such...
 
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