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Old 15th July 2012, 02:48 PM   #11
s2kov is offline s2kov  Canada
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Well done senor tony!

Congrats!
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Old 15th July 2012, 03:00 PM   #12
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very impressive
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Old 15th July 2012, 04:18 PM   #13
GTHICM is offline GTHICM  United States
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Default Beautiful work

Truly nice job, Tony. If the amp sounds as good as it looks, it should be really nice. Perhaps this is a run up to a GM70 project?
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Old 15th July 2012, 04:40 PM   #14
piero7 is offline piero7  Italy
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Congrats! WoW!
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Old 15th July 2012, 05:21 PM   #15
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Gm100 i would say

Inviato dal mio GT-I9001 con Tapatalk 2
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Old 15th July 2012, 10:37 PM   #16
AJT is offline AJT  Philippines
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Quote:
Originally Posted by GTHICM View Post
Truly nice job, Tony. If the amp sounds as good as it looks, it should be really nice. Perhaps this is a run up to a GM70 project?
thanks, i had my eyes set on the 813 tubes ever since i saw it in our science lab while in high school, i have a quad of those but seeing the high voltages involved, i had a rethink.......

a local tube scavenger sold me a quad of QE08-200 tubes, a pair can do 300watts with just 750volts on the plates, well within the range of my dmm's....so that will be my new mount everest......
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Old 15th July 2012, 10:41 PM   #17
AJT is offline AJT  Philippines
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Quote:
Originally Posted by Alexontherocks View Post
Wel done Sir!

You must be proud. Completing a project without commercially available products is real DIY.

Could you please take some measurements when you are finished?

Best
yes, i build my own irons for all my projects..........

will try to get some measurements when the amp is making music.....

this amp was meant to be a competition piece this July, but was postponed for November when we are having our anual HI-Fi show......
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Old 15th July 2012, 11:00 PM   #18
AJT is offline AJT  Philippines
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livening up......this is the term we used to call any equipment that is being turned on for the first time.....dealing with electricity, you just can't rush things up, there are certein rituals to be followed if you do not want smoke to come out......

to recap, tube complements are, CG-13 gas regulator tube equivalent to 0A2, 6N1p as input buffer stage, 6P15P as voltage amplifier and 6C33C as output tubes...
with the 6C33C, i used a 400 grit sand paper to remove tarnish on the pins and ensured good contact with the sockets..

tubes are aglow....
Click the image to open in full size.
Click the image to open in full size.

testing for voltage levels showed them to be very close to intended voltages, save the grid bias at -190volts....this is very easy to correct..
Click the image to open in full size.
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Old 15th July 2012, 11:26 PM   #19
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Simply outstanding!

Cheers,
Terry
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Old 16th July 2012, 05:45 AM   #20
roren is offline roren  Sweden
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Nice work Tony!
So much stuff, and still so neat and tidy.

Rolf
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