It's been a while since I have done a 5150, but IIRC the plate and screen voltages are in the high 400's, and you most likely wouldn't want any higher than that anyway as it will limit the type of output tube you can safley use without having to drop the screen voltages significantly (which in corrospondance with the voltage at the plates can have significant effect on how the valve operates, which will translate to a tonal effect that you may or may not like). If you install a choke I recommend that you also increase the value of your screen resistors in that amp as there will be less voltage drop across the choke at idle (although not much less). stock they are 100r, I would up them to 1K, which is a good standard value for most valves. for the choke I would maybe consider something with in the 3h-5h range. 90-120ma should be fine. better regulation is not always desireable.mace wrote:Hi,
because this is my first post in this forum, I would like to introduce myself. My name is Maciek Mucha I'am 29 years old and I live in Berlin/Germany.
Can you tell me the choke model-no you have used for this mod?
Have you rewire the standby switch?
Which voltage values have the screen, plate, v3+, v2+ and v1+ after modification?
Have you done any modifications to the power supply - beside the bias mod - to increase or decrease the voltages on screen, plate...?
My problem is, that no one in germany is making any kind of mods in Peavey Amps. All moded Amps in Germany come directly from USA. I don't wan't to spend 200 $ plus taxes for sending this amp to USA and get it back in any unknown condition. So I decide to make this mod by myself. I hope you will or can help me.
Mace
I would leave the power supply alone... do not be tempted to increase the amount of filtration. there is already plenty.
I don't know of anybody in germany personally that does Mods to 5150. You can try to ask Larry. I do know of Some Italians that will though, but I don't know if it is any cost benefit to you.
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