6s19p / 6n6p / lme49720,15 watts
6s19p / 6n6p / lme49720,15 watts
6s19p / 6n6p / lme49720,15 watts
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I've just finished my version of the Williamson 5-20. I'm extremely impressed with it.
The build thread is here Building a Williamson EL34 amplifier
The build thread is here Building a Williamson EL34 amplifier
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It weighs an absolute tonne as it has six heavy transformers and an Oak frame.
Although it outwardly appears like two mono-blocks in one chassis it isn't.
The toroids on the top of the chassis add together to provide the AC for the B+.
The toroids on the bottom of the chassis provide the HEATER and Cathode bias.
Although it outwardly appears like two mono-blocks in one chassis it isn't.
The toroids on the top of the chassis add together to provide the AC for the B+.
The toroids on the bottom of the chassis provide the HEATER and Cathode bias.
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6s19p / 6n6p / lme49720,15 watts amplifier circuit, if anyone is interested
You've posted this in the pages of finished projects
6s19p / 6n6p / lme49720,15 watts
one more photo
one more photo
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The populated PCB is available from E-Bay which is a real bonus. The bias circuit needs a bit of modification as discussed in the build thread. Other than that it is a really easy and high quality build.
4 x EL34 and 4 x 12AU7.
Hammond 1650H opts.
I put socket savers on the 12AU7s so they poke up a bit higher on the chassis.
4 x EL34 and 4 x 12AU7.
Hammond 1650H opts.
I put socket savers on the 12AU7s so they poke up a bit higher on the chassis.
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6s19p / 6n6p / lme49720,15 watts amplifier circuit, if anyone is interested
perhaps you could publish this schematic with component values added?
Did you make those transformers yourself or...?
6s19p / 6n6p / lme49720,15 watts
output transformers шл 25\25 and chokes are homemade , the power is converted from industrial тс70.first, the circuit was on a breadboard and the parameters of the output transformer were tested to get good performance, then a transformer with taps 4 and 8 R
output transformers шл 25\25 and chokes are homemade , the power is converted from industrial тс70.first, the circuit was on a breadboard and the parameters of the output transformer were tested to get good performance, then a transformer with taps 4 and 8 R
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Joined 2009
Paid Member
one more photo
Looks good! did you also make the chassis ? Looks to be as much work as the electronics inside it.
Very nice build, congratulations!
Could I please have the eBay link. If not allowed here please send me a PM.
BR
Eric
Here is the E-Bay link.
Williamson push-pull Amplifier circuit board For 12AX7/12AU7/EL34/KT88/6P3/6L6 | eBay
If you are contemplating building this amplifier please take time to read my build thread as there is a minor issue with the biasing.
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Member
Joined 2009
Paid Member
Here is the E-Bay link.
Just so darn curious, but this link, like several other eBay listings that I’ve noticed over the past few years, uses the word ‘fever’. A word of our times you could say. But I’d like to know what Chinese word keeps getting auto-translated into ‘fever’ and what the heck was the author really trying to say?
Probably just the "high temperature".But I’d like to know what Chinese word keeps getting auto-translated into ‘fever’ and what the heck was the author really trying to say?
Those "fever electrolytic capacitors" in the listing are Cornell Dubilier 381LX, which are rated at 105°C
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