Thanks for looking into it.
All the diodes are from BOM, according to product numbers. C4 also, 47uF EEU-ED2V470.
Is this the next place to look at? Can they be checked on the board?
Toroidal
Hi everyone,
I was lucky enough to receive my toroidal transformer today. Exactly what I ordered - 70 VA wound onto 100 VA core, with electrostatic shield between primary and secondary windings. Not potted, but won't be necessary as I will be putting it into its own housing, so that I can use it for any of the BB boards I will have eventually.
However I still don't have the latest PCB unfortunately - our wonderful enlightened government is running the place reminiscent of the old East Germany currently. Telling us when we may exercise (6am to 9am, what we may and may not buy (no alcohol or cigarettes may be sold, all restaurants are closed to sit-down customers though they may deliver phone-in orders), not allowing e-commerce to deliver if it is not an essential item (though electronic games, consoles are allowed) meaning I can not even order stand-offs for my PCBs much less components etc. Also a curfew from 9pm to 5am. No receiving or sending of international parcels are allowed if it is not an essential item. Major frustration.
But hey, I have enough other stuff to keep me busy in the interim. Here's a picture of the trafo.
Kevin
Hi everyone,
I was lucky enough to receive my toroidal transformer today. Exactly what I ordered - 70 VA wound onto 100 VA core, with electrostatic shield between primary and secondary windings. Not potted, but won't be necessary as I will be putting it into its own housing, so that I can use it for any of the BB boards I will have eventually.
However I still don't have the latest PCB unfortunately - our wonderful enlightened government is running the place reminiscent of the old East Germany currently. Telling us when we may exercise (6am to 9am, what we may and may not buy (no alcohol or cigarettes may be sold, all restaurants are closed to sit-down customers though they may deliver phone-in orders), not allowing e-commerce to deliver if it is not an essential item (though electronic games, consoles are allowed) meaning I can not even order stand-offs for my PCBs much less components etc. Also a curfew from 9pm to 5am. No receiving or sending of international parcels are allowed if it is not an essential item. Major frustration.
But hey, I have enough other stuff to keep me busy in the interim. Here's a picture of the trafo.
Kevin
Attachments
Hi Oliver,
There was movement overnight. There was a media release this morning that all e-commerce is allowed again. I suspect that it does not extend to imports and exports, but hopefully will be wrong.
Kevin
There was movement overnight. There was a media release this morning that all e-commerce is allowed again. I suspect that it does not extend to imports and exports, but hopefully will be wrong.
Kevin
Are the relays wotking on both sides of pcb (pos,negative)
Or should they be on top,I guess it doesnt matter as the tube holder is higher than relays.
Relays on top too I believe.
About half way down on this page:
Around the Blog-Fire | Audio Addicts Forum: Everything HiFi, Music and More
About half way down on this page:
Around the Blog-Fire | Audio Addicts Forum: Everything HiFi, Music and More
Last edited:
You passed the test!
Seriously though, apologies as my annotated schematic hadn't 'quite' caught up with the Mk3.
They are R13P and C10P.
For the links count the stripe hole as 1, then link holes 3 and 4 on each side.
O O O-O O
1
O O O-O O
Hi all,
A tiny revision in the BOM, highlighted in green:
BOM MM-MC - Google Sheets
This is not a major thing, more a refinement to the EQ.
Feel free to ignore it, just letting you know it's there.
A tiny revision in the BOM, highlighted in green:
BOM MM-MC - Google Sheets
This is not a major thing, more a refinement to the EQ.
Feel free to ignore it, just letting you know it's there.
Oboy those smd transistors are small,luckily I have a magnifying lamp..
If one regulator is for filament,those other 3 are for the high voltage for each tube,right? 😕🙂
If one regulator is for filament,those other 3 are for the high voltage for each tube,right? 😕🙂
No there is only one HV regulator. The two at the front are part of the input circuit design.
PCC88 is 7.6V +/-10% heater voltage.
Yes that's it.
1/4 watt are fine, apart from R9P and R10P which really need to be 0.4 or 0.5W.
0.5W resistors give a greater bulk material for the current to flow in so generally will have lower operating temperatures and lower thermal noise as a result.
1/4 watt are fine, apart from R9P and R10P which really need to be 0.4 or 0.5W.
0.5W resistors give a greater bulk material for the current to flow in so generally will have lower operating temperatures and lower thermal noise as a result.