The Amp Garage

Really appreciate the info. Tomorrow the new Bias pot arrives. Hope that takes care of the bias.

Updates to follow…

Thanks,

Dan

Finished the build of a Weber 6M45P. Built Martin Manning's Deluxe Light bulb limiter and plugged it in. Light turns on, Bulb dims, looked good, Plugged the KT66 into the Bias probe, turned it on, took it off Standby and was unable to bias the amp, it starts up at 21 ma and if I move the bias pot, i...

I caught the 100k resistor. Thanks. Ive learned so much this time around.

Dan

Thank you so much for the response. So if I understand correctly, I should be able to to convert the impedance to 16/8/4, so long as I make sure the negative feedback remains connected to the 16 ohm OT line? It does make sense now.

Thank you!

Dan

Reached a roadblock trying to wire the impedance selector switch of the Marshall Clone I'm working on. I have a 4 pole impedance selector switch, and have identified the common with my multimeter. What I don't understand is the wire that goes from the main board to the Yellow (16ohm) wire of the OT....

The OT is wired. I have yet to wire the main board which includes the bias, PI and the Preamp. So long as I'm not going to blow it up by plugging it in, it would be nice to see to check it out. Once the main board goes in it is extremely crowded, so much so that I have to modify the main board just ...

This is where I'm at. I've attached the schematic showing the power section. Additionally I have the filaments wired for all the tubes and have the power tubes completely wired.

So grateful that I have such experts from this site willing to help.

These are likely noob questions, so I apologize in advance. I’m in the middle of my 2nd build, a Marshall 45 watt plexi, and just finished the power section and really want to make sure that everything is working as it should before I continue with the build. I have checked continuity, but was wonde...

Haven't been able to find the answer online. The PT has a 125V and 120V primaries. Does the attached schematic show the 125V (BLUE) connected to the switch, or is the 120V (Brown) connected, or are both connected? If some one could explain the reasoning behind the 125V primary when the US power supp...

Can’t thank you guys enuf. The schematic is from a Weber 6M45P kit. All 10 capacitors are actually supposed to be on a vertical board attached to the lugs of the PT. Wish I knew about is beforehand. Lesson learned. It’s my second build and unfortunately I didn’t spend time with the schematic or layo...

Then there has to be a reason for the the 2 40uf caps in series, why else would the designer opt for 2 in series over just one 20uf cap? I realize this is likely a stupid question, but I'm really trying to learn this stuff. I really appreciate you r comments as it forces me to keep studying... Thank...

Thank you!

I think the kit used the cheapest components. Dont want to bad mouth anyone but the 10 capacitors on a vertical board seemed crazy. That was the point of the change in #s of caps.

Dan

I bought this kit and the power filter section is a total of 10 caps on one rather small eyelet board. Kinda crazy. I want to reduce the number of caps. Can I keep the schematic as is, but assuming I use the same voltages, replace 2 40uf caps with (1) 80uf cap. and replace the each of the 40uf and 8...

Can you send or post an Inventory? I'm sourcing a 3rd gen ODS 124. Let me know whatcha got...

Dan

I started my journey to build #124. Chassis and boards were delivered today. I was lucky enough to get a set from Taylor Cox. So excellent. My question of the day has to do with power and output transformers. It seems as if Hammond and Mercury Magnetics are the 2 manufacturers that source the twin r...