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Well, just looking at the voltages at Q604 (the transistor with the heat sink), Pin #17 (which should be the Collector voltage of +25vac) I’m reading +60vac. When I put the positive probe on the

This organ is now FREE...family wants it gone. New owner to pick it up in Hermitage, TN 37076. It's on a cart, we can help get it out of the house; single level, no significant steps.

Thank you so much!

I found an alternate source here (not a PDF, just a GIF, but on the other hand a wide scope view): http://www.captain-foldback.com/Hammond_sub/schematics/t100series/page5-32.gif

Oh, typos: unfortunately. I just wanted unfortunately. I just wanted ... 15 and 25V

Ned, did you check the power supply voltages ? Funnily, the other day I was able to download the T-500 Service manual from archive.org. Unfotunately I forgot to download part II, which contains

Here's a picture of the board layout.H --

There should be a picture of the board with the components labelled in your service manual.

Thanks. I’ll check the transistor voltages but how do I know what transistor on the schematic is which transistor on the board?

The transistors you've labelled 1 & 2 are part of the reverb drive amplifier. They provide the signal fed into the input end of the reverb springs. As such, they have no direct connection with the

Hi Chris, I’ve checked all the transistors on the pwr & reverb amp board (with the organ off) using an analog multimeter on the 1x ohm setting. All check out “ok” except the 2 metal can ones

If I recall, you said that the loud background hum wasn't affected by the swell pedal. The signal at pin 8 goes through the swell before going to the actual input of the amplifier. As the hum level is

Thanks. When I tested these points the schematic said to have key #25 down with upper drawbar 8’ out and expression pedal down. Also, I wondered if my multimeter was unable to read mv since I was

I shouldn't worry too much about voltages at the percussion board to start with, a fault here would only affect the percussion voices. Pin 8 on the power amp board is signal input to the amplifier.

Hi Chris - I've started to check different voltages of 2 of the boards.? I started looking at the Percussion board. At pin 10 with the perc. tab down I get 16 vdc? ? should be 16 vdc? ? ? ? ?

Chris - I’ve downloaded the schematics to study. The hum is present as soon as the organ is turned on. The hum’s volume is not affected by the swell pedal. It also is not affected with the Reverb

You will need a schematic, you can download some here, http://www.captain-foldback.com/Hammond_sub/schematics/t100series/. I'd start by trying to localise the fault. Does the hum volume vary with the

Thanks Chris - I’ve searched on some of your threads so you don’t have to reinvent the wheel in helping me. Is there maybe a particular thread you could steer me to that will help me step through

This project is still available and is now FREE. Come get it, otherwise it'll be discarded. Located in Hermitage, TN, 37076. Thanks, Robin Midgett K4IDC [email protected]> wrote:

Hi, I'm now retired, but I can still try to advise you. --