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Old 26th August 2012, 02:30 AM   #41
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Dear Tony,

Congratulations
I am awestruck by your knowledge and ability

Best regards,
Sam
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Old 28th October 2012, 12:17 PM   #42
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Quote:
Originally Posted by c1ferrari View Post
Dear Tony,

Congratulations
I am awestruck by your knowledge and ability

Best regards,
Sam
thanks...
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Old 28th October 2012, 12:18 PM   #43
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with fuses installed, power to the output traffo and output tubes are complete....the 3 minute delay timer shorts out the 12k/5W soft start resistor...this resistor is in series with the main B+ ac supply....voltages ramps up to about 100 volts and stays there until the 3 minute timing period is reached, this protects the output tube from thermal run-away, at the same time that the plate B+ is ramping up, the negative bias voltage is likewise ramping up and settles to a value around -75 volts....these steps ensures successful turn on of the amp....

at the end of the 3 minute timing period, the relay closes and the 12k resistor is shorted out thus the B+ finally ramps up to around 210volts dc.....it takes another 5 minutes for the plate current to reach about 200mA....i recommend to wait for 10 minutes before music is played to give time for the amp to settle down to business....

i set the bias pots for this plate current level and bias drift was observed...i am happy to report that drifts were minimal and after 2 hours the bias current actually goes down a bit by around 10mA....this is normal as plate voltages in triodes have an effect on plate currents.....

i also observed that bias changes were caused by changes in line voltages.....


set-up for final adjustment to bias the output tubes.....

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with my power meter monitoring the ac input to the amp, power factor was at 92%.....

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total watts measured at 218watts...

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line current....

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thermal scan of the bulb at socket side underneath the chassis, i have installed fans running of 7 volts dc to move a bit of air underneath the amp when bottom plates are installed...
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Old 28th October 2012, 06:10 PM   #44
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Made with all the rules of good behavior, I have to say.

Congratulations.
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Old 28th October 2012, 07:48 PM   #45
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Wow, nice! Thanks for sharing.
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Old 29th October 2012, 01:59 AM   #46
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thanks guys, i am excited about this design....the final operating points and power consumption predictions were spot on, computed versus actual.......i am happy....

the power trafffo is a little warm even after 3 hours, only the tubes are hot....

as predicted, the total power consumption was around 220 watts...so that at 20 watts music output, overall efficiency is a mere 10%...
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Old 29th October 2012, 10:59 PM   #47
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tube compliments: 6C33 output tubes, 6P15P voltage amplifier/driver, 6N1P buffer, CG13 150v gas regulator tube......as you can see these are all Russian tubes....
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Old 30th October 2012, 07:31 AM   #48
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Quote:
Originally Posted by Tony View Post
tube compliments: 6C33 output tubes, 6P15P voltage amplifier/driver, 6N1P buffer, CG13 150v gas regulator tube......as you can see these are all Russian tubes....
Hi Tony,
do you have any concerns about that?

Otherwise... my congrats! Great build!
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Old 30th October 2012, 09:44 AM   #49
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Originally Posted by ma_coule View Post
Hi Tony,
do you have any concerns about that?

Otherwise... my congrats! Great build!
none, i have grown to respect Russian tubes ever since i made my first 6H23 preamp....over a year ago.....

and after over 30plus years haitus, i ma making tube amps again, i am retired now and i know that i have to keep challenging my mind....an this is my way of doing it...
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Old 10th August 2014, 03:58 PM   #50
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AJT thanks a lot to let us to see your amazing work.
It looks 100% DIY project, congratulations

Also i did a couple of tube project but coudnt find a chance to deal with 6c33 but i am planing to do.
If posibble can you compare 6c33 SE amp's sound to the 300b because i have listened a couple of times 300b

Thanks
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