Search found 49 matches

by 9 volt
16 Mar 2024, 08:19
Forum: Amplifiers
Topic: Single ended tone control question
Replies: 7
Views: 744

Re: Single ended tone control question

Pin 3 on my amp is going straight to ground. (No capacitor)
by 9 volt
16 Mar 2024, 01:02
Forum: Amplifiers
Topic: Single ended tone control question
Replies: 7
Views: 744

Re: Single ended tone control question

Could there be an error in this schematic? 6ab8 has two pins going to ground 3 and 4.
They also go to a capacitor c2a. Thoughts?
Looking at another attached schematic for reference.
I am looking at updating the old multi capacitor and want to make sure I wire up correctly.
Thanks
by 9 volt
12 Mar 2024, 04:50
Forum: Amplifiers
Topic: Single ended tone control question
Replies: 7
Views: 744

Re: Single ended tone control question

Super! thanks for the ac30 reference.
by 9 volt
07 Mar 2024, 11:43
Forum: Amplifiers
Topic: Single ended tone control question
Replies: 7
Views: 744

Re: Single ended tone control question

Yep, I will keep it original, does anyone know how the tone works? Eg it’s not a capacitor to ground. Thanks again.
by 9 volt
06 Mar 2024, 01:54
Forum: Amplifiers
Topic: Single ended tone control question
Replies: 7
Views: 744

Single ended tone control question

Hi all, I’m restoring an old tube record player (mono) the tone control is positioned after the pentode. Does anyone know why it would be there?
I’m thinking of moving it after pre amp,

See attached schematic.

Thanks
by 9 volt
01 Dec 2023, 23:17
Forum: Pedal Debugging & Troubleshooting Support
Topic: Tc electronics t2 issues/repair
Replies: 1
Views: 642

Re: Tc electronics t2 issues/repair

The schematic for hall of fame looks very similar
See link
https://service-tcgroup.tcelectronic.co ... server.asp
by 9 volt
27 Nov 2023, 04:04
Forum: Pedal Debugging & Troubleshooting Support
Topic: Tc electronics t2 issues/repair
Replies: 1
Views: 642

Tc electronics t2 issues/repair

Hi all, I have a tc electronics t2 (digital reverb). It’s generating its own noise, when I change the reverb settings I can hear that it has an influence on the noise. I have audio traced the signal to the ak4556 ad da ic. The signal gets to there then seems to have the noise on pin 8. I’m wondering...
by 9 volt
03 Oct 2022, 00:40
Forum: Modern Stompbox Effects (1975 - ...)
Topic: DOD - FX32 Meat Box [schematic]
Replies: 38
Views: 41969

Re: DOD - FX32 Meat Box [schematic]

Hi all, I have an issue with my fx32 meat box. The bypass signal works with battery but not with a power supply…… just wondered if anyone has any thoughts on this? Thanks
by 9 volt
16 May 2022, 09:17
Forum: Pedal Debugging & Troubleshooting Support
Topic: Line6 m13 lcd issue
Replies: 1
Views: 433

Re: Line6 m13 lcd issue

Service manual can found here:
https://www.synthxl.com/m-13/
by 9 volt
16 May 2022, 05:55
Forum: Pedal Debugging & Troubleshooting Support
Topic: Line 6 m series lcd repair issues
Replies: 0
Views: 357

Line 6 m series lcd repair issues

Hi all, my line6 m13 has blank lcd screens. The colours still change and the effects all still work. But unfortunately the lcds are either blank or sometimes all black. Looking online it seems like a few people has this issue but I haven’t found a way to repair it yet. Does anyone have any advice? T...
by 9 volt
27 Feb 2022, 12:35
Forum: Pedal Debugging & Troubleshooting Support
Topic: Line6 m13 lcd issue
Replies: 1
Views: 433

Line6 m13 lcd issue

Hi all, I have an issue with the line6 m13. All effects work but the lcds are either blank or black boxes. (LCD colour backgrounds still work) It seems a pretty common issue when looking online, but there doesn’t seem to be any solutions. Has anyone had experience with this or any thoughts on what t...
by 9 volt
23 Sep 2021, 23:03
Forum: Pedal Debugging & Troubleshooting Support
Topic: Pog original power issue
Replies: 3
Views: 599

Re: Pog original power issue

No such luck…. Thanks
by 9 volt
20 Sep 2021, 00:32
Forum: Pedal Debugging & Troubleshooting Support
Topic: Pog original power issue
Replies: 3
Views: 599

Pog original power issue

Hi there, my pog when I plug in my pog to power the led flickers for a few seconds. During this time if I push the bypass switch it seems to crash. If I reconnect power a few times it starts up normally. I thought it seemed like a capacitor issue but they seem ok. Does anyone have any ideas? I’ve fo...
by 9 volt
02 Mar 2021, 00:40
Forum: Pedal Debugging & Troubleshooting Support
Topic: Eventide H949 issues
Replies: 0
Views: 817

Eventide H949 issues

Hi there, does anyone have any experience. Mine stopped working last week and now seems to only self generate its own sound...thanks
by 9 volt
03 Feb 2021, 10:10
Forum: Pedal Debugging & Troubleshooting Support
Topic: Identify diode smd
Replies: 1
Views: 571

Identify diode smd

Hi there I need to identify a faulty diode. It is smd (three legs like a small transistor) and has the id 44 written on it. Does anyone know what I’d get to replace it?
Thanks
Ps from digitech vocalist
by 9 volt
01 Dec 2020, 10:19
Forum: Pedal Debugging & Troubleshooting Support
Topic: Lester K trouble shooting
Replies: 3
Views: 870

Re: Lester K trouble shooting

I checked the v ref which seemed ok. I then started checking all the adc related resistors and found a faulty 51ohm on the d-out pin! This was the problem. So far it seems to be working! Two analogue inputs weren’t connected to the new adc (my fault). Resoldered. Anyway thanks again, it motivated me...
by 9 volt
28 Nov 2020, 23:31
Forum: Pedal Debugging & Troubleshooting Support
Topic: Lester K trouble shooting
Replies: 3
Views: 870

Re: Lester K trouble shooting

Hi there, thanks for getting back to me. The AD converter is a ADC108S022CIMT ADC, 10BIT, 200KSP.
by 9 volt
27 Nov 2020, 03:56
Forum: Pedal Debugging & Troubleshooting Support
Topic: Lester K trouble shooting
Replies: 3
Views: 870

Lester K trouble shooting

Hi there, I'm trying to fix my Lester k from electro harmonix. Unfortunately they don't give out schematics. The footswitches work (off/on, fast/slow rotary). But all potentiometers behave like they are on full (eg level 10) So volume is on full, drive is on full. All the potentiometers are unadjust...
by 9 volt
25 Feb 2015, 11:33
Forum: Pedal Debugging & Troubleshooting Support
Topic: mxr pitch transposer repair question
Replies: 4
Views: 894

Re: mxr pitch transposer repair question

Sure is complex. Voltages seem ok.
by 9 volt
23 Feb 2015, 04:08
Forum: Pedal Debugging & Troubleshooting Support
Topic: mxr pitch transposer repair question
Replies: 4
Views: 894

mxr pitch transposer repair question

Hi there, has anyone tried repairing an mxr pitch transposer. Mine seems to be generating its own sound rather than altering the input signal. Many tantalum caps inside that I have replaced not fixed the problem. Thanks