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Old 2nd June 2012, 04:41 PM   #4131
cjkpkg is offline cjkpkg  United States
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Location: Roswell GA
Default Just "finished" a Broskie CCDA rev 2 preamp

John had sent me a board to evaluate a while back and I finally got around to essentially completing it.

Still need to add the power switch and get some feet for the chassis.

Funny thing is that I used some "bad" ebay 6CG7's to do my smoke testing, they fuzzed/hissed really bad in my Aikido. I ended up doing the first sound test with them still in the sockets and they are DEAD SILENT!!!

Another weird thing is that I am measuring 4.2V across the 300ohm cathode resistors...so that is like 14mA... didn't know a 6CG7 was capable of that...

This is the first time I have used a Toroid for the PT and using a Par Metal chassis, which is very nice BTW...

The sound is excellent...I need to live with it for a while and break in the coupling caps...running russion K40Y9's .22uF and Auricaps .47uF in parallel.

Here is a righteous under skirt shot...
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Old 4th June 2012, 12:12 PM   #4132
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Quote:
Originally Posted by arhanghelxxl View Post
Hi !
My amp kt88 - 6sn7, 2 channels 100 watts each...!
Pretty nice, do you have an schematic for that?

Thank you
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Old 4th June 2012, 02:55 PM   #4133
tim614 is offline tim614  United States
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Quote:
Originally Posted by arhanghelxxl View Post
Hi !
My amp kt88 - 6sn7, 2 channels 100 watts each...!
How much B+ are you running the amp?
What's your bias current?
Is it pentode?
I just finish a pair of mono block PP kt120 with B+ 580
and bias @ 75ma
UL conected and I don't really know how many watts I'm pushing.
Just wondering how you measure your.
Thanks
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Old 5th June 2012, 12:56 PM   #4134
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Quote:
Originally Posted by tim614 View Post
Just wondering how you measure your.
Thanks
Why not goind the old school route? Hook up an 4/8 dummy power resistor to the output, measure voltage, and let ohm's law make the magic. Should help to have a scope.
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Old 5th June 2012, 03:05 PM   #4135
yehan is offline yehan  Philippines
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Pwedi po,ba ang vacuun tube for disco music ksi sa pagnka alam ko pang
classic lng sya ma,ganda pa kinggan
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Old 5th June 2012, 03:29 PM   #4136
tim614 is offline tim614  United States
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Quote:
Originally Posted by regiregi22 View Post
Why not goind the old school route? Hook up an 4/8 dummy power resistor to the output, measure voltage, and let ohm's law make the magic. Should help to have a scope.
Thanks!
Just got a scope a week ago, I will be doing the ohms law thing, but I was wondering if the 100 watts claim was an estimate.
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Old 5th June 2012, 04:56 PM   #4137
jervill is offline jervill  United Kingdom
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Quote:
Originally Posted by yehan View Post
Pwedi po,ba ang vacuun tube for disco music ksi sa pagnka alam ko pang
classic lng sya ma,ganda pa kinggan
The wired state forum is bilingual maybe it's more polite to post in Tagalog there. But to answer, I suppose with sensitive enough speakers then disco is not out of reach. After all these amps use to provide the sound in cinemas.
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Old 5th June 2012, 06:42 PM   #4138
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This is my Tube amp.
6922-12AU7- 4 X EL84 PPP
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Old 6th June 2012, 03:20 PM   #4139
Fenris is offline Fenris  United States
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Just finished a 6P14P amp for a friend housed in a stainless steel breadbox.
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Old 6th June 2012, 03:27 PM   #4140
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Switching psu and a lot of leds. Interesting/different. Do you have schematic? How is the sound?
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