How do you run your amps? Are they plugged in only for listening sessions. or have you rigged in a switch of some sort? In the factory config of amp on bottom, these things running all day long running hot as Hades , even with a fan, is not really agreeable to me.
Let me know how you run yours. I am about to embark on refurbishing mine one way or another.
Let me know how you run yours. I am about to embark on refurbishing mine one way or another.
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If this is your main system i would build a stand-by function like Acoustat did. Half the heater voltages and power down the HV. Then there will be a bias of min 70v on the grids.
The issue with this that you will need 2 transformers for the upper tubes. These can then be switched in series to half the voltage. Maybe diodes could do the trick as well as then only half of the sinewave will pass to the heaters. Be carefull with high voltages !
Best regards,
Frank
The issue with this that you will need 2 transformers for the upper tubes. These can then be switched in series to half the voltage. Maybe diodes could do the trick as well as then only half of the sinewave will pass to the heaters. Be carefull with high voltages !
Best regards,
Frank
When I got my 2SW-1s they had power switches. It was only recently I learned they didn't come with this from the factory, I thought they all had it.
I run my speakers upside down with the amps on top. The covers and fans have been removed. Overheating is not a problem after 3 years.
But I definitely turn mine off when not in use, if only to appease my electric bill! Hope this helps.
I run my speakers upside down with the amps on top. The covers and fans have been removed. Overheating is not a problem after 3 years.
But I definitely turn mine off when not in use, if only to appease my electric bill! Hope this helps.
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There is a temperature sensor on the frame that switches off the amp at overheating.
Anyway, i would build a stand-by switch even if it only used at power on as it pre-heats the tubes before HV is applied.
Anyway, i would build a stand-by switch even if it only used at power on as it pre-heats the tubes before HV is applied.
Since my earlier post I have strongly changed my "no fan" opinion and have added a quiet Noctua fan, wired to run even when the amp is off.
I am fussy about a quiet room and these are quiet fans. I can barely hear them.
Don't laugh at my install... OK laugh if you want! I had the wall warts lying around and they did make things easy ":^)
I am fussy about a quiet room and these are quiet fans. I can barely hear them.
Don't laugh at my install... OK laugh if you want! I had the wall warts lying around and they did make things easy ":^)
I think i blow one of mine when i added 300uF (4000 volt) caps and my relay circuit did not work as intended.... oooops! Happy to have a fuse (not small enough it turned out, since the transformer went goodby) otherwise i would have put the whole neighborhood in darkness... when you calculate energy storage in a capacitor remember that it is the voltage squared! 12uF does not seems to be very much but convert the energy to a cap at 50 volts and you will all be surprised!