This is good advice and it's how I was able to diagnose issues with my own magnetron build.
Metslguy55 needs to follow the audio through the schematic. Do you have audio at the level pot? At C7? At R12?
If the pt2399 is giving you effect audio then the pedal is mostly working, there's not a...
Man, I ran into the exact same issue with needing way too much resistance to bias my ac128's and I tried 5 different matched sets from 2 different suppliers.
A couple of very helpful users here helped me troubleshoot the issue. I ended up getting some p28's from ebay out of the Ukraine and they...
Okay, I pulled out those ac128's from pedal hacker and installed the p28's. And they work awesome!!! They bias with only 7k resistance and they sound amazing. They cleanup very easily with the guitar volume. I don't know why the ac128's from pedal hacker where so shity. So I guess I'll stick...
Sorry I haven't kept this thread up to date. I'm a golf course superintendent and I also manage a small water treatment plant so I've been incredibly busy lately. But I did get to try my pedal hacker ac128's and I have the same problem with biasing them. I'm currently using like 21k of...
I'm still waiting for the p28's to arrive in the mail but tracking says they've been in Canada for 5 days (just not where in Canada) so I should have them fairly soon.
Also I ordered some real ac128's from pedal hacker but they still haven't arrived yet.
I tested all My leaky Motorola...
I really enjoy this reverb. It lays down a nice ambience that you don't get with regular belton brick. I had trouble with mine, a broken trace but once I sorted that out it really started to sound cool.
Thanks chuck, I took your advice and ordered 20 p28's from ebay. They where like 18$ with shipping. I'm still going to try to get ahold of some AC128. Looks like pedal hacker is the only reliable source currently.
Yeah, good point about banzai... Maybe I'll try doing some research on ebay then. I'll Look for someone with some good feedback, at 2$ a piece I don't really care if I have to throw-away 3/4 of them.
Awesome, thanks for the help. I'm checking with banzai music to see if they can send out some AC128's that arn't so leaky and if not maybe ship out some "work alike" transistors. If they cant then I'll try to source some from pedal hacker if small bear doesn't get any in soon.
The LEDs are used as clipping diodes. They do emmit light, but that's not what they're used for here... They cut the signal wave into a square wave and add distortion.
You could drill holes for the and poke them up but they arn't going to be very bright