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Old 18th October 2012, 04:43 AM   #4381
mhouston is offline mhouston  Australia
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@disco: can you show us the underside of the amp section. The amp on the thick timber work with just the tubes poking up.
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Old 18th October 2012, 09:44 AM   #4382
disco is offline disco  Netherlands
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Got the idea mate Here you go:

Click the image to open in full size.

Notice the short distance between power tranny, choke and OT.
No hum, no noise at 100dB loudspeaker.
Those R-core can't compete with amorphous core
but are a decent bang for the buck. Mid and highs are nice.
Rod's filament supply is in the frontpanel, at the copper strip.
Coupling done with 1uF Audicap and two 0,1uF Cardas.
The TCC oil is a little inductive, fine for that first position.
Wiring between HT rectifier and first cap is shortest possible.
LV supply has been split in noisy front (near tranny)
and 'clean' end at the tube sockets.
Finishing the plinth is for today, as is tidying up wires.
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Old 18th October 2012, 10:22 AM   #4383
andRookie is offline andRookie  Norway
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Default Inspired by Allen Wright.

6H30 cascode (copy from AW)
EL34/ KT88 output, ccs bias
21st Century Maida Regulator on driver/ input.
5k OPT
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File Type: jpg AWPP2CS okt12 (640x359).jpg (210.1 KB, 1298 views)
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Old 19th October 2012, 10:13 AM   #4384
RK1 is offline RK1
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example
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Old 24th October 2012, 04:45 AM   #4385
56oval is offline 56oval  Australia
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Quote:
Originally Posted by RK1 View Post
example
Very tasty ,a over head shot please
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Old 24th October 2012, 09:18 AM   #4386
mhouston is offline mhouston  Australia
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Quote:
Originally Posted by RK1 View Post
example
Does look good. Better images please.
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Old 24th October 2012, 04:58 PM   #4387
RK1 is offline RK1
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one of the last photos (with speaker)
T?umacz Google
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Old 25th October 2012, 08:58 PM   #4388
Steve Cresswell is offline Steve Cresswell  United Kingdom
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Here is my latest project.
It is my take on the new Transcendent "Son of Beast" output transformerless tube amplifier.
The design was built from the circuit that appears in Bruce Rozenblit's latest book "Tubes & Circuits"

Click the image to open in full size.

It uses the earlier 40V heater PL509/519 top cap sweep tube rather than the newer production octal based JJ EL509.
Other than that I followed Bruce's circuit and layout to the letter.

Steve

Last edited by Steve Cresswell; 25th October 2012 at 09:01 PM.
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Old 25th October 2012, 09:21 PM   #4389
carolus is online now carolus  Belgium
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Quote:
Originally Posted by Steve Cresswell View Post
Here is my latest project.
It is my take on the new Transcendent "Son of Beast" ...
It uses the earlier 40V heater PL509/519 top cap sweep tube rather than the newer production octal based JJ EL509.
Steve
Hi Steve,
Congrats with your new "son" OTL ...
Nice unit.
Did you a "point-to-point" wiring (or pcb)?
Did you a test/measure about power output (before clipping) and stability Dc-output?
My experiences with OTL T12(concept Trancendent): the PL519 is a good tube (even second hand after test).
(This is not a product placement)
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Old 25th October 2012, 10:20 PM   #4390
Steve Cresswell is offline Steve Cresswell  United Kingdom
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I did a point to point job.
I have not measured the power output, but Bruce quotes 15WPC.
The amp is rock stable with the DC offset staying at zero once set.
Once the initial setup and consequent settling in period has expired (about three days)
The whole thing is set and forget.
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