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Messages - Diablo_IV

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1
Amplifier Discussion / Re: Info on Sunn Stinger 100 amp
« on: November 13, 2019, 12:38:27 PM »
never mind, I believe i need a 40 vct secondary transformer.   If anyone could tell me what amount of amperage i may need to power this amp that would be great.  I see some transformers with 40 vct but with only at .06 amps. 

2
Amplifier Discussion / Re: Info on Sunn Stinger 100 amp
« on: November 12, 2019, 10:35:53 AM »
thank you guys, so yea im going to replace all the filter caps. The transformer looks toasted and only puts out about 14vac where i should be getting 19 or 20.  When dealing with winding ratios do we divide 120 by 20, or 110 by 20?

3
Amplifier Discussion / Re: Info on Sunn Stinger 100 amp
« on: November 05, 2019, 11:58:00 PM »
hey teemuk can you throw me a schematic for the sunn stinger 60, I am working on a stinger 20, sound the the preamp is of the same design.

4
Amplifier Discussion / Re: Fuse or resistor?
« on: June 20, 2019, 06:59:07 PM »
here

5
Amplifier Discussion / Re: Fuse or resistor?
« on: June 20, 2019, 06:56:02 PM »
A few more pictures.  You can see the transistor collectors acting as heatsinks which melted out the solder joints on the bottom.  would it be safe to say these transistors should be replaced?

6
Amplifier Discussion / Re: Fuse or resistor?
« on: June 20, 2019, 05:10:46 AM »
inside the amp i found a big 15k resistor in a bag.  It seems like the original plan was to replace the thermistor with a 15k resistor.

7
Amplifier Discussion / Re: Fuse or resistor?
« on: June 19, 2019, 06:04:34 PM »
yes, thank you, it is connected to the collector of a tip31c transistor.  The collector is acting as a heatsink, being throughbolted and soldered to the same trace as the component in question.  The solder joint for the heatsink/collector is melted out a bit as are some of the other transistors collector joints.  I cut the thing and half and included a picture.  I am still not sure what it is. 

8
Amplifier Discussion / Re: Fuse or resistor?
« on: June 18, 2019, 06:19:19 PM »
thank you for the schematic, the amp I have is the solid state version.  Here is the schematic. I see a strange resistor symbol with a circle around it where B (58vdc) comes out towards the transistors.   I am wondering what that symbol is.

9
Amplifier Discussion / Fuse or resistor?
« on: June 18, 2019, 04:21:33 AM »
I am restoring an old Randall RG50-112 amp.  When I opened the chassis I saw this component in the picture.  It was mounted vertically on the pcb board with one of the leads either clipped intentionally or blown.  I am trying to figure out if this is a simple fuse or a thermistor or a resistor fuse.  Anyone recognize one of these?  No ohmage and no connectivity reading.

10
Tubes and Hybrids / Re: 12ax7
« on: July 21, 2015, 04:21:52 AM »
awesome thank you.  \m/

11
Tubes and Hybrids / Re: 12ax7
« on: July 18, 2015, 10:14:54 PM »
so is there any need for a preamp with this chip.  IF so what would the goal be.  I also eventually want to install an overdrive channel, something with some extremely high saturation. 

12
Tubes and Hybrids / Re: 12ax7
« on: July 18, 2015, 02:35:27 AM »
cool thank you, I think I may use it.  So basically the tda2040 is acting as the power amp in this circuit. It also looks like its acting as a differential op amp. 

13
Tubes and Hybrids / 12ax7
« on: July 17, 2015, 06:30:35 AM »
I am going to attempt to build my first guitar amp.  I have a transformer whos output is 24.5V RMS.  Would this be enough juice to bias a 12ax7 for the preamp stage?  I think all of the tube preamp schematics ive seen use like 400 volts to power the 12ax7 in the preamp.  Could I use a 12ax7 in a preamp with only 25 volts for a psu?  If it is possible what would be any negatives. 

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