The Amp Garage

Don’t forget with these great little testers to discharge the cap before testing.

My co worker killed is tester 3 days after he built it with a charged up 450 volt cap.

You need to confirm after discharging that there is no more voltage left in the cap then the battery that powers it.

Here’s a 1000uf 50v Rubycon that swollen and starting to leak and it still test out at only .94 ohms, unfortunately it’s only 5 years old.

Yes, sorry, more like ten times!
I had the morning coffee brewing but none yet to start the brain up.

Thanks for this test out and post, and yes that’s over a 10% different which is a lot!

They also need to be mounted right next to each other so that all wire length used is the shortest. Also I consider the leads of semiconductors as part of its built in heat sink and as such contributing to the items wattage rating. For Zener diodes used in tube amps ( especially if near the output t...

It rang a bell to me since I have had a few great Marconi tubes over the decades, and instead of diving into one of my amps that has one in it to get a photo for you I went to the Tube World Express site for a photo.

To have more front panel real estate you might consider stacked pots for two of the tone controls.

To get a nice leg up on a two channel amp layout in one chassis you might want to check out the schematic of a big stereo tube amp like a HH Scott 272.

Due to the large area of white lettering that tube has and the size and shape of the plates and the round getter I think this is what your tube is, or atleast the brand that it is.

It would not be the first time that a utility step down transformer out on a pole took a indirect hit of lightning and all the utility company did was replace whichever fuse blew, leaving a somewhat defective transformer out on the pole. If you know any of your neighbors there see if you can try a a...

Poor or no ground would not effect a amps distortion caractoristics .

Plug a voltmeter into the other outlet in that wall socket to
1st see what you have for wall voltage .
2) to see if it drops down when you play the amp.

That dope is a high voltage insulating lacquer and will dry too stiff even though it may say its flexible. You want a latex product . You can use very thinned out white Elmer’s glue applying a little at a time, or better yet this product. Either way test it the stuff out on a cheap old blown 6 or 8”...

It might interest you to see the schematic for my 54 GA77. This amp sounds amazing and especially when you jump both channels. Anyone of the 30 or so that have played it want to buy it. This model amp was made in true Gibson fashion with like 3 different tube complements this version is the most rar...

Interesting that no fuse blowing has taken place! If you know anyone with a good tube tester like a Hickok 600 or such a test out in it for shorts would pick that right up. I would love to know what it’s internally arcing to. If that tube is removed from the amp does the bias voltage seen on pin 5 o...

Yes. With too high a wattage limiter bulb a SS amp may not turn on / power up enough to even idle.
Many times when the voltage is too low all you will hear out of the speaker is hum which might lead you to think that the amp has a problem when it does not.