I just found one of these in a rage room and, with the owner’s permission, took it home. Not sure what my next step will be. Don’t know if it works but it’s beautiful.
That is incredibly sad, I’m glad you rescued it, what a wasteful society we live in! I’m sure it needs work that is probably out of the scope of most people’s ability and knowledge. Email slothtronix@gmail.com and we can talk about what is involved if you would like
Nice video showing your WA-P2 with power supply. Can you tell us more about the power supply? Is the B+ supply regulated? Is the filament voltage AC or DC and is it regulated?
Well it was a while ago that I built it and I no longer have it but to my best recollection the filaments were AC and the b+ was 300v well filtered DC that was then filtered some more in the preamp but I could be mistaken at this point. There was no voltage regulation but the toroidal transformer was way overkill so there was little voltage drop with an amp and the preamp running. Each plug was also isolated to help with any vdrop, everything was fuse protected. Hope that helps, I’m not sure I’m remembering it accurately but that’s what I remember!
@@tsloth1390 Thank you for the added information. The power supply is a stumbling block for many interested in the WA-P2 preamplifier. Seeing a successful example, like the one you built, will encourage others to investigate using these preamplifiers.
@@teddriver_6021 they’re great little preamps... they only draw 10 mA of B+ so if you’re looking to make one just for the preamp it could be much much smaller, this one I believe had 10mA @ 300v for each of the preamp plugs and then 100mA@300v maximum or somewhere thereabouts for the amplifier and test plugs
It’s an excellent preamp, I went through it and restored all the dying components and cleaned it up, replaced the tubes etc. I wish I didn’t sell it but it was taking up space and the future of the full project was uncertain at best
I just found one of these in a rage room and, with the owner’s permission, took it home. Not sure what my next step will be. Don’t know if it works but it’s beautiful.
That is incredibly sad, I’m glad you rescued it, what a wasteful society we live in! I’m sure it needs work that is probably out of the scope of most people’s ability and knowledge. Email slothtronix@gmail.com and we can talk about what is involved if you would like
@@tsloth1390, okay, thanks!
Nice video showing your WA-P2 with power supply. Can you tell us more about the power supply? Is the B+ supply regulated? Is the filament voltage AC or DC and is it regulated?
Well it was a while ago that I built it and I no longer have it but to my best recollection the filaments were AC and the b+ was 300v well filtered DC that was then filtered some more in the preamp but I could be mistaken at this point. There was no voltage regulation but the toroidal transformer was way overkill so there was little voltage drop with an amp and the preamp running. Each plug was also isolated to help with any vdrop, everything was fuse protected. Hope that helps, I’m not sure I’m remembering it accurately but that’s what I remember!
@@tsloth1390
Thank you for the added information. The power supply is a stumbling block for many interested in the WA-P2 preamplifier. Seeing a successful example, like the one you built, will encourage others to investigate using these preamplifiers.
@@teddriver_6021 they’re great little preamps... they only draw 10 mA of B+ so if you’re looking to make one just for the preamp it could be much much smaller, this one I believe had 10mA @ 300v for each of the preamp plugs and then 100mA@300v maximum or somewhere thereabouts for the amplifier and test plugs
I’m pretty sure i have this exact preamp and power supply
Did you sell this a little while back on ebay?
I sold it on reverb!
It’s an excellent preamp, I went through it and restored all the dying components and cleaned it up, replaced the tubes etc. I wish I didn’t sell it but it was taking up space and the future of the full project was uncertain at best