Does the trem speed knob change the speed of the tick? On most trem circuits the LFO still runs even if it is switched off. Maybe check you have the right valve in the tremolo socket as that can cause issues. Poke around the trem circuit with a wood chop stick and see if you can hear any change. Phil.
Well you have no +9 volt rail. Now go check you have +9Volts at the output of Q8 the 7808 reg chip. The output leg is on the left (looking at the layout) it goes to C58. If no +9V then likely the chip is fried. Phil. Speaker is not needed for this test.
Last post by Psabin8951 - March 31, 2023, 10:20:41 AM
Having resolved rectifier issue on this amp and having replaced all tubes the amp now works BUT when I plug a guitar lead in, what is a barely audible tick becomes loud and clear. Turning the cut control down makes it worse. It is there where tremelo circuit is on or off. The tick pattern is constant changing to a harder tick every few seconds. Can anyone assist? Is it a filtering cap gone awol?
Unfortunately I haven't completed this one yet, my dad got really sick early last year so I flew up to where he lived and stayed with him for quiet some time. And then it was the funeral, cleaning up his house and sorting out what I wanted to keep etc. It kept me occupied for 6-7 months and then I didn't get back to the Sunn Beta project. I did finish one of the Marshall 12 watt amps I made a PCB for though.
I remember I was tweaking the resistor values in the channel switching circuit so it would work better and only use 1/4 watt resistors, I don't think I had a lot left to do before the PCB was finished for the BASS version I was building.
I can not see any reason why it will not work, I left the Gerber files I sent to JLCPCB to get the PCB's made in the first post
Thanks for reminding me, I will drag it out and get into it again very soon. Are you interested in the Lead version or the Bass version ?
Hey Tassieviking. Awesome work on this, I'm jealous of your PCB design skills!
I was just wondering if you'd made any progress with the building process as I'd be really interested to have a go at this project myself. I've built two tube amps (currently on my third!) but I'm a big fan of SS stuff and would like to branch out.