That's exactly what I had in mind
I'll ask.
Hi BB... Was just wondering.... And thanks for the update
Since we don´t have the schematics....
We have 2 x 7DJ8/pcc88. Could you tell if the ECC83 is wired 6.3volt or 12.6volt for the filament??
Just that I have a bunch of 6N2P-EV lying around, so these would be nice to use, if wired 6.3volts
The ECC83 is wired 6.3V with a series resistor of 2 off 8.2 ohm parallel resistors.
You can use a 6N2P except you will need to re-wire the heater connections.
Pin 9 will need to be isolated as it is a screen connection in the 6N2P.
Alan aka Firebottle.
Hey Bigman.
I believe you have the gain set to 68db for MC cartridges.
Is it possible to reduce the gain to 40db by making some resistor value changes?
Cheers
You would need to remove the BF862 fet and connect the PCC88 cathode to signal ground through a biasing component, my choice is a red LED. The 470nF capacitors C105/205 can then be removed
Then apply the input to the PCC88 grid with a 47K ohm grid resistor. Currently the grid is connected to signal ground so would require modification to the pcb.
Alan aka Firebottle.
You will need to re-wire the heater connections.
Pin 9 will need to be isolated as it is a screen connection in the 6N2P.
Alan aka Firebottle.
Shouldn´t be too hard
Thanks a lot Alan, to take your time to answer these Q´s
I now have a stock of 50 BF862 If anyone needs help sourcing them.
These are legitimate ones and guaranteed.
£4 for 4. You may think "why do I need 4?"
Well, they are easy to drop and impossible to find again lol.
Seppo, I'll send your 4 ASAP
If anyone is interested, I also have a few spare boards now too.
Available to sell individually now.
Thanks to everyone participating so far, looking forward to the updates!!
These are legitimate ones and guaranteed.
£4 for 4. You may think "why do I need 4?"
Well, they are easy to drop and impossible to find again lol.
Seppo, I'll send your 4 ASAP
If anyone is interested, I also have a few spare boards now too.
Available to sell individually now.
Thanks to everyone participating so far, looking forward to the updates!!
I would take 4 BF862 please.
Sure, You can use BF861C if tgey are easier to get for you. if not, drop me a pm and we'll sort it out.
Oliver
PC-board arrived today
Supperb looks and quality so far. Thanks, Bigman... for the oppertunity....
Don´t know when the build will start, but I´ll be sure to post pictures along the way
Great stuff! I'll look forward to watching the progress.
Thanks again.
First thing is to get the board to fit your supply of tubes
Cut a few traces and resoldered nw connections, to get V-111 to accept filament 6.3 volts between pin 4 & 5.
That makes me feel sad lol. It was so pretty!!
Good work, what valves are you going to use?
BF862´s, wirelinks & most resistors done
Lovely! It's nice to see this. Thank you for the pics!
Now available here too:
Bigbottle DIY Hybrid Valve Phonostage PCB - MC Only!! Created in the UK!!! | eBay
Bigbottle DIY Hybrid Valve Phonostage PCB - MC Only!! Created in the UK!!! | eBay
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