2P29L Pre-amp

[MrEd]

I tend to suggest sticking with 3.3uF as the lowest value at the output of a preamp. This would support feeding a 10K load, which sounds really unreasonable until your buddy brings over his solid state power amp to try with your preamp.

Dont let that guy in.... 🤣

 

[gable]

I tend to suggest sticking with 3.3uF as the lowest value at the output of a preamp. This would support feeding a 10K load, which sounds really unreasonable until your buddy brings over his solid state power amp to try with your preamp. (Or if you decide later to plug in a powered subwoofer)

Oh, damn good point. I will very likely have a powered sub or two for awhile.

Thank you as always sir!

 

[UncleBingo]

Dont let that guy in.... 🤣

Hahaha!

 

[Wntrmute2]

What are the pink resistors you are using? I see the Mills but what else have you in there or are planning to use??

 

[gable]

What are the pink resistors you are using? I see the Mills.

Takman REX, 1w carbon film

 

[Wntrmute2]

Thanks. How do they compare to the Kiwames? Any idea?

 

[gable]

Thanks. How do they compare to the Kiwames? Any idea?

I've not really compared thoroughly, though I tend to like the Takman's a bit more I think. They only make up to 1w, so I can't use them everywhere.

 

[gable]

I've had a few minutes here and there and was able to make some progress. I got the coleman regulator boards built, and installed, installed the output caps, and wired up a few more bits. I've got the material to make the rear plate and the front panel material should show up tomorrow. There's some chance I'll make the front and rear plates this weekend.

I mounted the coleman regulators on the far side, to keep them and the incoming filament wiring on the opposite side of the chassis as the incoming signal wiring. I'm hoping this helps keep the amp nice and quiet.

Hard to see in these pictures, but behind the capacitors there are grommets on some pass-through holes. These holes, are for the wires to/from the selector switch, and AVC switch. The middle c-channel brace is really just to help shield the signal wiring from noise.

 

[gable]

I've had a little bit of time here and there over the last few days and today to make some progress. I got my Rod Coleman regulators and raw dc boards finished, tested and now wired up.

I need to make some longer L brackets to mount the front and rear panels, maybe tomorrow I'll sneak some time and get those knocked out.

 

[UncleBingo]

I've had a little bit of time here and there over the last few days and today to make some progress. I got my Rod Coleman regulators and raw dc boards finished, tested and now wired up.

I need to make some longer L brackets to mount the front and rear panels, maybe tomorrow I'll sneak some time and get those knocked out.

View attachment 22447


View attachment 22448

Looks good!

 

[MrEd]

Getting down to the finish, looking great.
I hope you like it.