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[Enzo]

Hi, may I suggest you start a new thread for your repair. It gets confusing discussing more than one repair in a thread.

Fuses blow for a reason,...

[Enzo]

emails are OK< but CALLING has you talking to real people there.

[Enzo]

Oh, you were trying to remove the CHASSIS, you said CIRCUIT BOARD earlier.

[Enzo]

I never thought about it. Interior photo please? Usually just pull the screws, and take the nuts off the jacks and pots

[Enzo]

The flyback diodes are before that resistor and should not affect it.

[Enzo]

Yep, and one trick there is to turn off the room lights, arc spark is way easier to see in the dark.

[Enzo]

OK, if the resistor burns with no tubes installed, look for something shorting the screens node to ground, or an extremely leaky filter cap. And rare, but...

[Enzo]

Piece of advice: it doesn't matter if it is common or not, we just need to find the cause. Another nit pick: It is the low voltage, high current pins on the...

[Enzo]

The output cannot source current into the positive half cycle into the load. When it is in this state, just disconnect the load and run without, does it...

[Enzo]

What does it cost to look?

And try CALLING Shure Brothers and asking if they can provide the documents.

[Enzo]

I know I have a few 40408 in storage, and I just yesterday cleared a path to the storage drawer thing they would be in. I'll check.

Meanwhile,...

[Enzo]

If a crystal cracks, it generally becomes inert. In all my years, I have seen good ones, and ones that do not work. I don't recall ever seeing one that...

[Enzo]

To use this trick, the gun is already on its side, so I just leave it there. It isn't an iron.

It looks like this

...

[Enzo]

I have a selection of crystals for other applications, and if I think I have a dead one, I just sub another in its place and find out. Just for test, it...

[Enzo]

Capacitor - F&T, 500V, Type A, Axial Lead | Antique Electronic Supply (tubesandmore.com)

[Enzo]

Cheap solder pot:

Use an old Weller gun with the two pipes sticking out and the tip which is essentially a wire bent in two. Now take an empty...

[Enzo]

If there is a faulty solder connection or a crack in the copper traces, pushing and [robing each part physically may help expose that. Since we are working...

[Enzo]

No you should not find AC on pin 2 and pin 7, you should find AC BETWEEN pin 2 and pin 7. Don't measure to ground, measure from pin to pin. The tube doesn't...

[Enzo]

I have a different theory. When you touch it, you are injecting some hum. This new hum happens to be out of phase with the existing hum, and so it cancels...

[Enzo]

He said dropping transmitters sometimes cracks the Crystal - that is a part inside that determines frequency. He hopes modern day crystals are more robust...

[Enzo]

Sure. Just want him to realize he is just picking up the environment, not the transmitter.