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Those key contacts are precious metal. Playing it can knock the dirt off and bring them back. My H100 loses a few pitches/overtones when I let it sit for 6 months or so, then after a week or so of...

Nearly all power supplies from about 1964 to 1980 work the same. Switcher power supplies are different but that started about 1980. Most power amps after tubes and before IC's are pretty similar,...

The Hammond operators (ladies?) did superb jobs soldering mains power on the back of the ampenol plugs and on the motor capacitors in the h100. My replacement joints don't look that good, and I had...

My Sohmer piano, My Steinway piano, My Hammond h100's and my Wurlitzer 4500 all are 6 7/16" per octave. Leave it to the exporters to make it cheaper and have everybody in my world praise them for...

I begin to love the organ when KLEF-FM radio played the E. Power Biggs Bach Organ Favorites Vol 1 and Vol 2 about 1963-4. Before that, loved the organ scene in Snow White, and bought the 45 RPM The...

Lubrication is good. Took approximately 3 weeks to do any good on my H182 bearing that was squeaking because the floors are uneven in my house. You could buy a long nose spout oiler like the Shell...

Well, let me know what you do. My 4500 and the 4300 the keys look all the same level but I have too many power supply problems to tell how it works yet. I would look at the 950 manual carefully....

Take some data, chop the problem in two, is the fastest way to fix stuff. power capacitors are known failure points at 40 years, check your power supply, at the capacitor at least. Then later at 14...

Congratulations. Great price. It takes two-three weeks for oil to make it from the funnel through the threads to the bearings, so waiting is good. My $135 A100 had never been oiled or used much; I...

Yeah, the LM3900 is a common very cheap op amp, with different manufacturers having different prefixes and suffixes. You can download the datasheet from datasheetcatalog.com. + power supply voltage...

Jimmy williams is the expert on Gulbransen's. He usually looks through once or twice a month.
In the meantime, i would look for the power amp. It will have a couple of 1" diamond shaped...

I started taking the tubes in Mother's 1954 television to the corner store about 1959. Dad & I wired a new room on the house in 1962, using the Sears Roebuck "wire your house" pamphlet. I tried the...

If it has 2 leads, a 5 w axial will replace it. The metal cans went the way of the flying saucer conference rooms, those were the days. I think the flat end is the line end, which should be the plus...

Did you test the zener? by lifting one leg and checking forwards & backwards with 200 ohm scale of the DVM? It is not like you have to buy a $120 capacitance tester or anything, and there is no...

It is a lot cheaper to replace e-caps, than haul your organ to Nashville, LA, or Houston, to find somebody that "knows what he is doing". We can't get a 15 year old Rogers bought from a local dealer...

You could put a 2 ohm 20 watt resistor between the power supply and the organ. Then measure the voltage across the resistor. V=I*R. I keep some of these around for problems like this. Keeps from...

I find cleaning general gunk that Family Dollar non-chlorine bathroom cleaner is very useful. This is a spray bottle of dilute ethylene glycol monobutyl ether. On mechanical appearance parts I...

I find the Hammond H100-200-300 high frequency response quite artistic. The original owners in many cases are pretty enthusiastic, but most new purchasers disrepect it because it is not a B3. The...

I learned to fix tube electronics when I was 8 with the tube chart, the tube tester at the corner store, and when that didn't work, a bicycle ride with the car radio to my chemistry teacher's house...

The AC power for the organ runs into the AO39 powe amp, then out through the amphenol connector to the power switch, then back to the AO39 power transformer, and from the power switch to the preamp...

The agility issues Mother tackled first. I have a third finger with the end cut off, was always "helping" it with the fourth. She had the John Schaum # 1 book that she learned on (she quit lessons...

You are in luck. Allen sells and services their own equipment but are not very helpful to the do-it-yourselfer. It depends entirely on how much your district repairman wants to be helpful. Analog...

An Interesting review. Thanks for the book links, I've been looking for a teacher that knows something about popular music & I can only find a baroque organ post-graduate and an 80 year old lady...

Mark connectors with arrows or take pictures if possible before you remove anything for cleaning. One pin off or a connector backwards can blow up things or make it work strangely. Removing and...

Congratulations. Spray contact cleaner may help your switches and connectors. I use spray aliphatic hydrocarbon cleaner, flammable so don't smoke, have open flame, or electriticy on or off within...