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.
Search found 4594 matches
- Wed May 15, 2024 9:03 pm
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 29
- Views: 1076
- Wed May 15, 2024 2:10 pm
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 29
- Views: 1076
Re: Illinois brand capacitors still bad?
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.
- Tue May 14, 2024 12:21 pm
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 29
- Views: 1076
Re: Illinois brand capacitors still bad?
Yes, sorry, more like ten times!
I had the morning coffee brewing but none yet to start the brain up.
I had the morning coffee brewing but none yet to start the brain up.
- Tue May 14, 2024 11:20 am
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 29
- Views: 1076
Re: Illinois brand capacitors still bad?
Thanks for this test out and post, and yes that’s over a 10% different which is a lot!
- Sat May 11, 2024 11:19 am
- Forum: Technical Discussion
- Topic: Can I Parallel 2 Mosfets in VVR?
- Replies: 22
- Views: 493
Re: Can I Parallel 2 Mosfets in VVR?
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...
- Fri May 10, 2024 10:05 am
- Forum: Technical Discussion
- Topic: ID this tube?
- Replies: 7
- Views: 225
Re: ID this tube?
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.
- Thu May 09, 2024 10:01 pm
- Forum: Technical Discussion
- Topic: Two 20 watt amps in one chassis - layout/grounding
- Replies: 17
- Views: 462
Re: Two 20 watt amps in one chassis - layout/grounding
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.
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.
- Thu May 09, 2024 3:37 pm
- Forum: Technical Discussion
- Topic: ID this tube?
- Replies: 7
- Views: 225
Re: ID this tube?
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.
- Thu May 09, 2024 9:49 am
- Forum: Technical Discussion
- Topic: Bad power?
- Replies: 10
- Views: 270
Re: Bad power?
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...
- Wed May 08, 2024 10:10 am
- Forum: Technical Discussion
- Topic: Bad power?
- Replies: 10
- Views: 270
Re: Bad power?
Poor or no ground would not effect a amps distortion caractoristics .
- Tue May 07, 2024 9:10 pm
- Forum: Technical Discussion
- Topic: Bad power?
- Replies: 10
- Views: 270
Re: Bad power?
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.
1st see what you have for wall voltage .
2) to see if it drops down when you play the amp.
- Tue May 07, 2024 10:13 am
- Forum: Technical Discussion
- Topic: Not Amp Stuff, but Speaker Dope...
- Replies: 1
- Views: 77
Re: Not Amp Stuff, but Speaker Dope...
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”...
- Mon May 06, 2024 11:50 pm
- Forum: Technical Discussion
- Topic: Gibson GA-50 tone stack
- Replies: 16
- Views: 401
Re: Gibson GA-50 tone stack
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...
- Sun May 05, 2024 7:19 pm
- Forum: Technical Discussion
- Topic: JJ E34L (brand new) emitting a white light - has anyone seen this before?
- Replies: 5
- Views: 174
Re: JJ E34L (brand new) emitting a white light - has anyone seen this before?
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...
- Sun May 05, 2024 11:57 am
- Forum: Technical Discussion
- Topic: Light bulb limiter tured bright at power on
- Replies: 6
- Views: 222
Re: Light bulb limiter tured bright at power on
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.
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.