Search found 1275 matches

by lolbou
05 Aug 2020, 20:46
Forum: Amplifiers
Topic: 6V6 Mystery Amp
Replies: 12
Views: 732

Re: 6V6 Mystery Amp

The 6L6 hypothesis is likely... Check the output transformer for impedance?
by lolbou
09 Jul 2020, 21:55
Forum: Pedal Debugging & Troubleshooting Support
Topic: Vintage EHX Small Clone MINI-CHORUS SAD1024 Help please
Replies: 23
Views: 1482

Re: Vintage EHX Small Clone MINI-CHORUS SAD1024 Help please

Seems like the wet signal is lost somewhere, so you need to scope or audioprobe the signal in the delay line (from pin 1 of the first opamp through the 1µF cap, and up to 2N4340 and 27k resistor.)

Could be a bad FET, bad transistors, opened resistor...... The SAD is not the likeliest of all then.
by lolbou
27 Jun 2020, 21:23
Forum: Pedal Debugging & Troubleshooting Support
Topic: Bazz Fuzz - No sound
Replies: 10
Views: 453

Re: Bazz Fuzz - No sound

How can I do that? For continuity, put your DMM in "diode" mode. Some DMMs beep when there is continuity. Or check DC resistance to be zero at each end of the ribbon cable and between each pair of 3PDT switch. To check the pot, measure the DC resistance between wiper (middle lug) and the grounded o...
by lolbou
27 Jun 2020, 21:20
Forum: Pedal Debugging & Troubleshooting Support
Topic: Bazz Fuzz - No sound
Replies: 10
Views: 453

Re: Bazz Fuzz - No sound

Intripped wrote: 27 Jun 2020, 20:58 also, be sure to connect your guitar to the INPUT jack and not the OUTPUT jack (happened many times to me...)
Oh yeah, or wired the FX IN and FX OUT backwards (did this one as well)...
by lolbou
27 Jun 2020, 19:44
Forum: Pedal Debugging & Troubleshooting Support
Topic: Bazz Fuzz - No sound
Replies: 10
Views: 453

Re: Bazz Fuzz - No sound

Check for continuity on the footswitch lugs (for signal). Check for continuity as well on the ribbon cable (these can be brittle).
Check pot as well, to see if it's not shorted.

Looks like some solder pads are missing on your pics too...
by lolbou
23 Jun 2020, 12:41
Forum: Amplifiers
Topic: How to improve tube amplifier tone by changing one part
Replies: 101
Views: 7898

Re: How to improve tube amplifier tone by changing one part

I was thinking about the "natural reverb" and "increased sustain" bits and it came to me that the caps might be slightly microphonic! Would also explain why that first grid position has more impact and my test had controlled for that (the poweramp wasn't even on). Time for another test, methinks! N...
by lolbou
19 Jun 2020, 20:14
Forum: Amplifiers
Topic: How to improve tube amplifier tone by changing one part
Replies: 101
Views: 7898

Re: How to improve tube amplifier tone by changing one part

This kind of reasoning is consubstantial with the God of the gaps: No, again you read me too quickly, and you read me wrong. You said you know already from the theory. I've said that your theory is most probably an ideal capacitor one, and that the real capacitor one is much harder to take into acc...
by lolbou
19 Jun 2020, 11:40
Forum: Amplifiers
Topic: How to improve tube amplifier tone by changing one part
Replies: 101
Views: 7898

Re: How to improve tube amplifier tone by changing one part

It feels pointless to ask at this point, but do you sincerely not understand that this is about the limits of human brains? It can be dismissed through theory alone. Talking about limits of human brain and capacitor theory, i think you actually can't compute exactly what's going on in the bloody ca...
by lolbou
12 May 2020, 19:03
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hiwatt Tube Overdrive - gutshots & schematic
Replies: 14
Views: 2161

Re: Hiwatt Tube Overdrive - gutshots & schematic

OK, I measured the voltage directly on pins 4 & 5: 18.5V (using original power supply). With the tube in it? Is it a regulated DC supply? If not, maybe the current draw drop the voltage down? Edit : just checked on a picture on the internet : looks like 18V@1A, most probably regulated... :scratch: ...
by lolbou
11 May 2020, 13:19
Forum: Amplifiers
Topic: How to improve tube amplifier tone by changing one part
Replies: 101
Views: 7898

Re: How to improve tube amplifier tone by changing one part

FiveseveN wrote: 11 May 2020, 10:03 You only need to blind the test if what you're assessing is the (difference in) subjective experience.
It is indeed. It's being well-said, therfore the blinding wipes it off...
by lolbou
11 May 2020, 09:36
Forum: Amplifiers
Topic: How to improve tube amplifier tone by changing one part
Replies: 101
Views: 7898

Re: How to improve tube amplifier tone by changing one part

Ye old demagogy at it's finest - tying unrelated things to prove one's point does not work anymore. Don't get me wrong, these are just experience examples... And these are not made upon beliefs (which bloodletting and vaginal fumigations were indeed). When Hoffmann invented the aspirin from the mol...
by lolbou
11 May 2020, 07:53
Forum: Amplifiers
Topic: How to improve tube amplifier tone by changing one part
Replies: 101
Views: 7898

Re: How to improve tube amplifier tone by changing one part

History has taught us that in no case we should accept suggestions based on authority, but on clear and documented evidences. That's dismissing experience a bit too fast, and even evolution to some extent... And these two has taught us a lot more. How would you explain great apes eating medicinal p...
by lolbou
06 May 2020, 12:52
Forum: Amplifiers
Topic: How to improve tube amplifier tone by changing one part
Replies: 101
Views: 7898

Re: How to improve tube amplifier tone by changing one part

Now the question : which mustard? This is a mustard to me (same colour as my mustard from Dijon in the fridge) : https://images.reverb.com/image/upload/s--v88G6GzD--/f_auto,t_large/v1462569503/pqhqluo7mbj6oema966e.jpg But are these mustards as well? https://www.mveducation.com/assets/products/236690...
by lolbou
05 May 2020, 12:18
Forum: Amplifiers
Topic: How to improve tube amplifier tone by changing one part
Replies: 101
Views: 7898

Re: How to improve tube amplifier tone by changing one part

I have NOS 18nF/400V (10%) mustards here, not Mullard maybe, but still.... They measure quite good within the tolerance. I'll test it in a Fender Hot Rod. Measure the 22nF installed and have a go at it...
by lolbou
05 May 2020, 10:39
Forum: Amplifiers
Topic: How to improve tube amplifier tone by changing one part
Replies: 101
Views: 7898

Re: How to improve tube amplifier tone by changing one part

the most important capacitor to change in ANY tube guitar amplifier is the output coupling capacitor connected to the plate of the tube performing the very first stage of amplification :!: Do not ask me why - just try replacing it with a "mustard" capacitor it and see for yourself C'mon guys, it's ...
by lolbou
05 May 2020, 03:31
Forum: Amplifiers
Topic: How to improve tube amplifier tone by changing one part
Replies: 101
Views: 7898

Re: How to improve tube amplifier tone by changing one part

Thanks for the tip Steve, it definitely worth a try! I may follow the advice in my future amp re-build!

Stay safe as well! :hug:
by lolbou
04 May 2020, 19:03
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Vox - V816 Distortion Booster: GE an SI versions! [schematic]
Replies: 16
Views: 3940

Re: Vox - V816 Distortion Booster [schematic]

Was it the built-in effect in the very early age of Brian May's Red Special guitar?
by lolbou
03 May 2020, 09:25
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Pearl DS-06 Distortion - question about modding
Replies: 1
Views: 476

Re: Question about modding a Pearl DS-06

Also would ditching that rotary for a dual gang pot make for a more versatile control versus having a 6 sets of preset values? I would leave R10 and R16 and try a 10k pot to replace the others. If you go from R11 to R15, you can see that they rise slowly at first, and then increase dramatically. Lo...
by lolbou
21 Apr 2020, 08:58
Forum: Pedal Debugging & Troubleshooting Support
Topic: Crybaby 95Q automatic, no sound with guitar but with finger
Replies: 8
Views: 695

Re: Crybaby 95Q automatic, no sound with guitar but with fin

Only way to get it again, unplug the jack, plug again, fuzz sound for 3 s and stop. You've just build yourself a timer! Bravo! :horsey: I would try some audioprobing, but you may have a blown opamp in the IC? Now for the 3s stuff, does it happen as well when the pedal is used with a wall wart power...