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Discussion in 'Shock Brother's DIY Amps' started by theprofessor, Feb 2, 2019.
hmm see below
You're right, good eye... those small upgrades and updates are all potentially useful.
Adjustable bias -- a very useful, convenient way to help you set your amp to run 'best.' Not a mod to the original sound, but a modern way to avoid having to replace resistors to set the all-important power tube bias to save your tubes and get the best sound.
Rectifier diodes -- these are simply protection against possible tube failure damaging your circuit. Easy, minor, and definitely will not alter the sound.
The 470R 'screen resistors' from pin 4 to 6 on the power tubes are an 'update' that adds protection and may improve the overdrive tone.
If I'm seeing right, the 1.5K control grid resistors connect to the 220 K either way. Recall pin 6 in inactive in these tubes, so that lug is just a tie point. Tying it to pin 6 is probably more physically stable than hanging it in the air.
Ok, think I’ve got the gist. But I cannot see from the updated layout what kind of diodes are used and the pins to connect them to. Can you shade some light?
i am ordering some missing parts and I will start a new tread on my build. Hopefully it wont look too amateurish.
For the diodes, and in fact all the items we discussed, you can hunt up good info on Rob Robinette's amazing pages, especially on 5e3 and 5f6a mods.
Rob's pages explain all of those tweaks and are immensely useful to any amp builder.
Thanks guys. I have been reading alot on his website. I didnt think those mods were compatible with different amps. I guess I have a lot to learn.