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01-23-2024, 10:18 PM
(This post was last modified: 01-23-2024, 10:21 PM by physics.
Edit Reason: To complain about Peavey's PCB quality.
)
Quick updates:
Last week I removed the self-drilling sheet metal screws holding on the front diamond plate panel, installed t-nuts, drilled bigger holes in the diamond plate, and re-installed with machine screws.
Saturday I replaced the 2W 330R metal oxide screen resistors with 5W 1k flameproof wire-wounds.
Today I placed an order for the bias mod kit so I can properly bias the amp and run whatever tubes I can get cheap within the confines of the applicable ratings, form factors, pin-outs, etc.
The intent is to use this amp regularly over the coming school semester for rehearsals and gigs, so I'm trying to get reliability mods done sooner rather than later. I think I have the resistors on hand to do the HV bleeder mod as well, so those will likely being going in soon too. Gonna clip out the other two ceramic discs to avoid having them short out and cause issues. One of them is strapped across the bias winding, and I'd really prefer that didn't short. I think I read somewhere that some rectifier diodes are under-spec'd too, will have to get to those as well.
Edit: Oh, and while the amp is fairly comfy to work inside, the board quality isn't great, to no-ones' surprise. I had at least one trace flake off some solder mask during rework despite my efforts, so the motivation to spin my own circuit card is growing.
Last week I removed the self-drilling sheet metal screws holding on the front diamond plate panel, installed t-nuts, drilled bigger holes in the diamond plate, and re-installed with machine screws.
Saturday I replaced the 2W 330R metal oxide screen resistors with 5W 1k flameproof wire-wounds.
Today I placed an order for the bias mod kit so I can properly bias the amp and run whatever tubes I can get cheap within the confines of the applicable ratings, form factors, pin-outs, etc.
The intent is to use this amp regularly over the coming school semester for rehearsals and gigs, so I'm trying to get reliability mods done sooner rather than later. I think I have the resistors on hand to do the HV bleeder mod as well, so those will likely being going in soon too. Gonna clip out the other two ceramic discs to avoid having them short out and cause issues. One of them is strapped across the bias winding, and I'd really prefer that didn't short. I think I read somewhere that some rectifier diodes are under-spec'd too, will have to get to those as well.
Edit: Oh, and while the amp is fairly comfy to work inside, the board quality isn't great, to no-ones' surprise. I had at least one trace flake off some solder mask during rework despite my efforts, so the motivation to spin my own circuit card is growing.
