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Old 25th March 2013, 11:29 PM   #4911
multi is offline multi  Australia
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Default 572b amp

Push pull 572B amp using Sowter output transformer and c core power transformer.
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Old 26th March 2013, 09:12 AM   #4912
multi is offline multi  Australia
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Default GEC 4 X KT88 200 watt amp

GEC 4 X KT88/6550 200watt amp.{ needs new tubes.}
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Old 26th March 2013, 10:36 AM   #4913
mhouston is offline mhouston  Australia
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Multi: where in Australia are you from?
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Old 26th March 2013, 10:50 AM   #4914
TonyTecson is offline TonyTecson  Philippines
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Default 813 set

work in progress....opt's are being built....the 813 is wired as a triode running on 900volt plate at 100mA, on 6k:6ohm OPT, this amp uses the 11HM7 driver with g2 regulated using the 0A2 gas reg tube...

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Old 26th March 2013, 07:26 PM   #4915
hpeter is offline hpeter  Slovakia
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Quote:
Originally Posted by multi View Post
Push pull 572B amp using Sowter output transformer and c core power transformer.
can you share the schematic? is it the 160 tube?
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Old 27th March 2013, 12:24 AM   #4916
peterfarrow is offline peterfarrow  United Kingdom
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Some pics of my first amp back in 1998, still using it today...
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Old 27th March 2013, 11:17 AM   #4917
Parafeed813 is offline Parafeed813  Netherlands
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Quote:
Originally Posted by Tony View Post
work in progress....opt's are being built....the 813 is wired as a triode running on 900volt plate at 100mA, on 6k:6ohm OPT, this amp uses the 11HM7 driver with g2 regulated using the 0A2 gas reg tube...
Hey, my favorite valve
Keep us posted on the results. Do you have different brands of 813 / QB2-250 to try?
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Old 27th March 2013, 02:44 PM   #4918
Vincent77 is offline Vincent77  Europe
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Quote:
Originally Posted by peterfarrow View Post
Some pics of my first amp back in 1998, still using it today...
Very nice!
I see some ECL82 in push-pull... a gas regulator and its 6AS7G pass tube... two beautiful magic eyes.. what are the other tubes?
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Old 27th March 2013, 05:29 PM   #4919
bonzo15011978 is offline bonzo15011978  Italy
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Quote:
Originally Posted by peterfarrow View Post
Some pics of my first amp back in 1998, still using it today...
Relly interesting!
I red wonders of this little tube (E/PL82): matched with E/PC86 as a preamp tube and in SE triode configuration can give the most beautiful 0,5w ever.
Or so it's stated on "high sensitive" a german book published about 11 years ago.

Can you share the scheme and your listening impressions?

Ciao!

Last edited by bonzo15011978; 27th March 2013 at 05:32 PM.
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Old 28th March 2013, 11:54 AM   #4920
peterfarrow is offline peterfarrow  United Kingdom
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Quote:
Originally Posted by Vincent77 View Post
Very nice!
I see some ECL82 in push-pull... a gas regulator and its 6AS7G pass tube... two beautiful magic eyes.. what are the other tubes?
thanks!

Two pairs ECL82 in push pull, two EM71a magic eyes, ECC83 preamp double triode. 85A2 gas regulator as a voltage reference for another ECC83 running as a cascode error amplifier driving the grids of 6AS7G, both sections in parallel for a regulated PSU at 270volts 250mA

The pentode sections of the ECL82s are wired in ultralinear to a pair of Sowter 10W @ 15Hz OPTs (big for 10W to get the low end nice and flat), the triode sections of the ECL82s are running as a longtailed pair phase splitter.
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