Crappy Mouser... I looked 3 times to see if there was no backorders, and two days later, I discover that the order was not shipped because two parts are suddenly on backorder and they'll only ship EVERYTHING in late June...
Anyways... since I'll have nothing until two months, I'd like to ask, where should I look to reduce the tube output's gain? (So I'll have less hum but instead just turn the volume knob higher)
Anyways... since I'll have nothing until two months, I'd like to ask, where should I look to reduce the tube output's gain? (So I'll have less hum but instead just turn the volume knob higher)
Hey, updates!
I didn't touch the amp since I got my Mouser order.
However, I had a little time to experiment with various grounding possibilities, and nothing worked.
But, I found the problem is really with the PSU section!
When I turn the amp down, it still plays for about 1-2 seconds (With caps in series with the speakers to kill DC), and there's no hum!
It's been a long time since I've worked on the amp, I don't even remember what every parts I bought are for! (All I know is that on the sticker of these parts, there's the "GAINCLONE" comment I put in my products list at Mouser. Unfortunately, I didn't enter all the information)
4x Dual schottky rectifier diodes 10A 150V
------Separating amps and tube rectifier
1x 1µF 305V "X2" MKP capacitor
------No idea, maybe the same as the 1µF in tube power supply here? http://www.customanalogue.com/diytubegainclone/ps.htm
2x 0.1µF 305V "X2" MKP
------No idea...
4x 2200µF 50V Nichicon UHE cpas
------Filter caps for the four DC lines there will be.
2x IRF610B
------Building something similar to the SLCF... I found a schematic for this that used only one tube half, but can't find it anymore...
2x LM317
------Regulate tube positive line, second unit, I've got no idea...
1x LM337
------Regulate tube negative line.
2x 220ohm 5W resistors
------See 220ohms in JLTi DIY's PSU schematic
4x Carbon composition gridstoppers
------Replacing the two metal-film gridstoppers, two "just-in-case" replacements.
I didn't touch the amp since I got my Mouser order.
However, I had a little time to experiment with various grounding possibilities, and nothing worked.
But, I found the problem is really with the PSU section!
When I turn the amp down, it still plays for about 1-2 seconds (With caps in series with the speakers to kill DC), and there's no hum!
It's been a long time since I've worked on the amp, I don't even remember what every parts I bought are for! (All I know is that on the sticker of these parts, there's the "GAINCLONE" comment I put in my products list at Mouser. Unfortunately, I didn't enter all the information)
4x Dual schottky rectifier diodes 10A 150V
------Separating amps and tube rectifier
1x 1µF 305V "X2" MKP capacitor
------No idea, maybe the same as the 1µF in tube power supply here? http://www.customanalogue.com/diytubegainclone/ps.htm
2x 0.1µF 305V "X2" MKP
------No idea...
4x 2200µF 50V Nichicon UHE cpas
------Filter caps for the four DC lines there will be.
2x IRF610B
------Building something similar to the SLCF... I found a schematic for this that used only one tube half, but can't find it anymore...
2x LM317
------Regulate tube positive line, second unit, I've got no idea...
1x LM337
------Regulate tube negative line.
2x 220ohm 5W resistors
------See 220ohms in JLTi DIY's PSU schematic
4x Carbon composition gridstoppers
------Replacing the two metal-film gridstoppers, two "just-in-case" replacements.
[off topic]
Dragonmaster:
I got a Link Instruments DSO-28264 from ebay and would like to share info with you. Please PM me so we can exchange emails!
Best,
Alex
Dragonmaster:
I got a Link Instruments DSO-28264 from ebay and would like to share info with you. Please PM me so we can exchange emails!
Best,
Alex
OK, I've just drawn a dual rectifier + filter caps PCB in ExpressPCB.
The rectifiers are some ST STPS20150C in a TO-220FP package.
http://www.st.com/stonline/products/literature/ds/7756.pdf
If possible, I'd like someone to check if the layout is OK, especially the ground plane. No need to take time to follow all the traces one by one, just needs a general check, as I'll put a regulator and other stuff on one of the outputs.
The rectifiers are some ST STPS20150C in a TO-220FP package.
http://www.st.com/stonline/products/literature/ds/7756.pdf
If possible, I'd like someone to check if the layout is OK, especially the ground plane. No need to take time to follow all the traces one by one, just needs a general check, as I'll put a regulator and other stuff on one of the outputs.
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