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I have that exact model number HP DMM. Excellent instrument, build like HP used to be built. 4 wire capability is nice when you need it.

Things will not be very happy with this condition Lee...

The second wire that Eric pointed out that goes to the transformer bolt is not necessary. One and only one DC ground should tie to chassis ground.

A real shame, that type of sepsis sets in fast and difficult to recover from.

Lee I cannot tell for sure how you have the bias transistors wired from a color code perspective. Is the transistor a 2N5088? Is its flat facing the chassis? If yes, then emitter is green wire? Base is black wire? Red is collector wire?

Welcome back Glen :-)

Lee, the bridge snubber has 2 plated through holes for terminating those 2 red wires to make it easier for you on your next build.

As they should Lee

Is your copper plate under the RCA jacks fully isolated from the chassis? It is essential...

We all missed you Gene. Take care of yourself and get better fast...

Are you counting the first bank as that which is next to the transformer? If yes, then banks 2 and 4 are the quasi comp construct and the collectors of these banks are the amp output. B- is applied to the emitter resistors on these banks. The collectors will be very near zero with no input to...

The Watts Abundant board uses a DPDT relay on the PL400 version. When the amp is powered off or the relay is de-energized due to a fault or during the power up delay, the speaker is grounded. Once energized, the relay armature moves to connect the speaker to the amp output. The speaker is...

George, your wife is getting jealous...

gonna eat your turntable...

Hi Bob The corporate incompetence stems from Deere's inability to maintain a service organization that can get to a farmers tractor repair in a very short period of time. In many corporate environments, the service organization is the red haired step child and practical thought processes are...

Math is your friend :-)

Probably sounded like a good idea at the time :-)

I chalk the John Deere service case up to corporate incompetence more than screwing their customers. You cannot fathom how much corporate incompetence exists out there... Then there is the Heather Bresch Epipen scandal, where the price was hiked 5x because they could. That is screwing your...

Definitely modified. These are stock PL700Bs that someone has taken the drill press to.

I fully understand why companies protect their IP, many put billions of dollars into the R&D to create that IP. If you are going to lock down that IP, then your service should be second to none. The John Deere story had none of that, it was locked down with lousy service. That is not right...