Search found 10574 matches
- Tue Apr 23, 2024 11:18 am
- Forum: Everyones Projects
- Topic: More NVA Board Based Stuff
- Replies: 4
- Views: 318
Re: More NVA Board Based Stuff
Spent the last few days trying various internal layouts and have decided on one that should be OK. I've ordered a selector switch and phono sockets for the buffer, if I can be arsed with it. If don’t do the buffer then the parts are still there for an integrated job.
- Fri Apr 19, 2024 1:08 pm
- Forum: Everyones Projects
- Topic: More NVA Board Based Stuff
- Replies: 4
- Views: 318
Re: More NVA Board Based Stuff
Thanks for that warning Nick. I’ll put a couple of back-to-back Zeners across the output to clamp the voltage to a safe level. It’s just a matter of deciding the values to clamp it at, so that on the one hand I don’t introduce distortion and on the other I don’t burn out the input stages. The BC182s...
- Fri Apr 19, 2024 11:41 am
- Forum: Everyones Projects
- Topic: More NVA Board Based Stuff
- Replies: 4
- Views: 318
More NVA Board Based Stuff
Started yesterday on this project by bending up a chassis and sorting out some kind of layout: NVABoards.jpeg Heatsinks need trimming to fit but that's no great problem. 16000uF of capacitance per rail. The chassis will follow my current styling, with wooden side cheeks. Top will be perforated alumi...
- Wed Apr 17, 2024 9:39 pm
- Forum: Everyones Projects
- Topic: OK…so I’m on wi’ summat
- Replies: 193
- Views: 44520
Re: OK…so I’m on wi’ summat
Maths is not my strong point, so I turn to PSUD. I also found a nice book http://www.tubebooks.org/Books/Schure_Rectifiers.pdf which helped me out no end. The bit on page 46 concerning fitting a bleeder resistor that draws a constant 10% of the full rated DC current output caused things to drop into...
- Wed Apr 17, 2024 6:43 pm
- Forum: Everyones Projects
- Topic: OK…so I’m on wi’ summat
- Replies: 193
- Views: 44520
Re: OK…so I’m on wi’ summat
Potted 4H choke can just about be seen to the rear of the VR tube:
- Wed Apr 17, 2024 5:13 pm
- Forum: Everyones Projects
- Topic: OK…so I’m on wi’ summat
- Replies: 193
- Views: 44520
Re: OK…so I’m on wi’ summat
Right then...OK...Er...Here we go again :D I've reverted the power supply to choke input, but this time, before doing anything, I made extensive use of PSUD, feeding in the parameters of the chokes I have, looking at all the waveforms, both current and voltage for any sign of trouble. I ended up wit...
- Mon Apr 15, 2024 10:41 pm
- Forum: Everyones Projects
- Topic: OK…so I’m on wi’ summat
- Replies: 193
- Views: 44520
Re: OK…so I’m on wi’ summat
Aye,
keeping the space between both HTs constant seems to work beautifully. Guess it’s one of those happy accidents.
keeping the space between both HTs constant seems to work beautifully. Guess it’s one of those happy accidents.
- Sun Apr 14, 2024 2:08 pm
- Forum: Everyones Projects
- Topic: OK…so I’m on wi’ summat
- Replies: 193
- Views: 44520
Re: OK…so I’m on wi’ summat
The idea came from the fact that the 6SL7s are drawing around 1mA each and I wanted to use a series VR105 tube to knock around 100V off the HT. I wanted that tube simply because unlike the 7pin VR tubes, it looks great when lit and I only have the one. I had to think of some way to make the tube pas...
- Sat Apr 13, 2024 9:08 pm
- Forum: Everyones Projects
- Topic: OK…so I’m on wi’ summat
- Replies: 193
- Views: 44520
Re: OK…so I’m on wi’ summat
A little more experimentation with the power supply today. I've seen series VR tubes used to feed the input stages of commercial amps such as those from Decware and Icon Audio, so I thought I'd give one a try in my own amp: EL34SEULSimplifiedPSU.png 22K shunt resistor makes sure around 15mA is flowi...
- Thu Apr 11, 2024 3:17 pm
- Forum: Everyones Projects
- Topic: EL34 SE
- Replies: 6
- Views: 370
Re: EL34 SE
Glad they got to you in one piece.
- Tue Apr 09, 2024 10:32 pm
- Forum: Everyones Projects
- Topic: OK…so I’m on wi’ summat
- Replies: 193
- Views: 44520
Re: OK…so I’m on wi’ summat
I don’t think they pose any danger Simon. My hairy-arsed soldering is probably to blame for the problems with mine.
- Tue Apr 09, 2024 9:16 pm
- Forum: Everyones Projects
- Topic: OK…so I’m on wi’ summat
- Replies: 193
- Views: 44520
Re: OK…so I’m on wi’ summat
I’m glad I got it going again with the JJ and the Sprague caps. It’s a great little amp and the ultimate quality of the sound doesn’t seem to depend on whether or not electrolytic caps or foil in oil caps are used. Yes, of course it is slightly better in the treble, with foil in oil caps but the dif...
- Tue Apr 09, 2024 3:25 pm
- Forum: Everyones Projects
- Topic: PSE EL84 Amplifier
- Replies: 43
- Views: 1615
Re: PSE EL84 Amplifier
Nope,
Still the same as it was.
Still the same as it was.
- Tue Apr 09, 2024 1:11 pm
- Forum: Everyones Projects
- Topic: PSE EL84 Amplifier
- Replies: 43
- Views: 1615
Re: PSE EL84 Amplifier
Not got the text Paul.
- Tue Apr 09, 2024 8:21 am
- Forum: Everyones Projects
- Topic: PSE EL84 Amplifier
- Replies: 43
- Views: 1615
Re: PSE EL84 Amplifier
Hi Paul,
PM your address and I’ll get them off to you.
PM your address and I’ll get them off to you.