Nice piece. Heat will tell you alot about a circuit. I like your method of connecting the caps. Very neat and tidy. Love your testing equipment too! Quality tools, quality results. Thanks for sharing and looking forward to the next...
Head on to 2021, I just saw this and it brought back so many memories. My first amp, which I inhearited from my dad was an H. H. Scott, which looked very similar to this one. I do not remember the model but it was 33 watts per channel and it had such a wonderful sound like I have not heard since it last broke sometime back in the late 60's. Wish I had kept it but it is now history. Thank you for sharing.
The original circuit for 222D model, there is no longer a capacitor hanging off Pin 8 of the 5AR4. Coming off pin 8, the schematic calls for a 20Ω (R206) resistor then two 20uF capacitors (parallel) going to ground. This was done so the 5AR4 can handle 40uF at start up, and to lower the voltage by 10V going to the output transformers. At 32:20, you found the first capacitor left offline probably to reduce the B+ voltage. Nice restoration project, well done.
Hi. Love your videos. Thank you! I have a wonderful restored 222C but do not know how to adjust bias. Have you done a video on this? Or is it perhaps in one of the 4 parts her that you could point me to? Thank you for your time, Lou
I'm working on a Scott 340B receiver, which also uses the 4x75 common positive can. Where can I find 75uF caps? I've looked all over and can't find any electrolytic 75uF. Room is also tighter under that unit. Going to try to re-form first, but not sure if it doesn't work what my plan B can be.
I just bought an exact same amplifier, except I can not adjust balance, bass, treble, for both A & B. Would you please let me know what had to the amplifier or what it needed to be done? Thank you kindly
Isn't DC on the filaments rather unusual? Mos tube amps that I have serviced have two special secondaries on the power transformer. Yellow wires for the rectifier tube filiment at 5 volts and green wires that is 12 volts center-tapped for the 6.3 or 12 volt heaters on the rest of the tubes.
Nice piece. Heat will tell you alot about a circuit. I like your method of connecting the caps. Very neat and tidy. Love your testing equipment too! Quality tools, quality results. Thanks for sharing and looking forward to the next...
Head on to 2021, I just saw this and it brought back so many memories. My first amp, which I inhearited from my dad was an H. H. Scott, which looked very similar to this one. I do not remember the model but it was 33 watts per channel and it had such a wonderful sound like I have not heard since it last broke sometime back in the late 60's. Wish I had kept it but it is now history. Thank you for sharing.
The original circuit for 222D model, there is no longer a capacitor hanging off Pin 8 of the 5AR4. Coming off pin 8, the schematic calls for a 20Ω (R206) resistor then two 20uF capacitors (parallel) going to ground. This was done so the 5AR4 can handle 40uF at start up, and to lower the voltage by 10V going to the output transformers. At 32:20, you found the first capacitor left offline probably to reduce the B+ voltage. Nice restoration project, well done.
Fantastic series and thanks for your time and effort!
Sounds amazing! I have the exact same one. It's a project waiting to happen.
Such a professional 👌verry nice amp to ☺️
Hi, which valves does it fit? How many watts does it deliver?
Hi. Love your videos. Thank you! I have a wonderful restored 222C but do not know how to adjust bias. Have you done a video on this? Or is it perhaps in one of the 4 parts her that you could point me to? Thank you for your time, Lou
I'm working on a Scott 340B receiver, which also uses the 4x75 common positive can. Where can I find 75uF caps? I've looked all over and can't find any electrolytic 75uF. Room is also tighter under that unit. Going to try to re-form first, but not sure if it doesn't work what my plan B can be.
I just bought an exact same amplifier, except I can not adjust balance, bass, treble, for both A & B. Would you please let me know what had to the amplifier or what it needed to be done? Thank you kindly
Great series!
Take care of the Polarity in your explanation. The red wire to the bias capacitor is negative. The can of the capacitor is positive.
Isn't DC on the filaments rather unusual? Mos tube amps that I have serviced have two special secondaries on the power transformer. Yellow wires for the rectifier tube filiment at 5 volts and green wires that is 12 volts center-tapped for the 6.3 or 12 volt heaters on the rest of the tubes.
maybe those tubes have directly heated cathodes otherwise its completely unnecessary to use dc instead of ac.
I have a type 399 Scott that needs a restoration, can you tell me what this service costs and will you perform it?
a lot of info on my site www.blueglow.net. a full resto can run from $200-350 all depending on what all it needs.
Are you gadden a Dress on, like GlassSlinger and the Others?
Never trust old electrolytic capacitors. Swap them out.
wow thats not nice