Search found 4590 matches
- Sat May 11, 2024 11:19 am
- Forum: Technical Discussion
- Topic: Can I Parallel 2 Mosfets in VVR?
- Replies: 6
- Views: 200
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: 212
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: 16
- Views: 408
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: 212
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: 259
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: 259
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: 259
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: 66
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: 380
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: 162
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: 212
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.
- Sun May 05, 2024 11:52 am
- Forum: Technical Discussion
- Topic: HILGEN BASSO 2501 Bass Amp Help Needed....
- Replies: 5
- Views: 136
Re: HILGEN BASSO 2591 Bass Amp Help Needed....
If the 2nd 12 ax7 where missing then the amp would not play. V2A is the mixer for both channels and V2A is the phase splitter to drive the power tubes. In terms of any amp with just a tone control all it does is cut back the highs when turned down . The level of bass produced will only change with h...
- Sat May 04, 2024 5:36 pm
- Forum: Technical Discussion
- Topic: Light bulb limiter tured bright at power on
- Replies: 6
- Views: 212
Re: Light bulb limiter tured bright at power on
The turn on current surge is much higher in a tube amp when the heaters are warming up then even what you would see with a 200 watt rms solid state amp getting powered up.
- Fri May 03, 2024 10:20 am
- Forum: Technical Discussion
- Topic: JTM45 Build, looks alive but no sound,
- Replies: 7
- Views: 256
Re: JTM45 Build, looks alive but no sound,
This might help.
- Thu May 02, 2024 11:42 pm
- Forum: Technical Discussion
- Topic: Tubes For Mesa DC-3 Amp.......
- Replies: 2
- Views: 78
Re: Tubes For Mesa DC-3 Amp.......
And what in terms of your playing needs would as you say “ sound fabulous “?