Search:

Type: Posts; User: Enzo; Keyword(s):

Page 1 of 18 1 2 3 4

Search: Search took 0.10 seconds; generated 23 minute(s) ago.

  1. Replies
    6
    Views
    128

    Hi, write this on the wall so you can see it...

    Hi, write this on the wall so you can see it often:

    "It is just a guitar amp"

    And by that I mean there is nothing critical in them, they are not precision lab equipment. If you look at most...
  2. Replies
    5
    Views
    87

    Well the op amps run on +/-17v, so 20v out? My...

    Well the op amps run on +/-17v, so 20v out?

    My experience with these is that MOST of the problems with signal outage are either the sliders themselves or the little assign push switches.
    ...
  3. Replies
    28
    Views
    537

    I had a phone in my shop, and I had a business...

    I had a phone in my shop, and I had a business phone at home. It sat next to my personal phone. If they call at stupid hours at home, I don't need to answer.

    I like the phone, if nothing else, I...
  4. Replies
    28
    Views
    537

    I think I have told it before, but... Had a...

    I think I have told it before, but...

    Had a guy bring a Fender Rhodes rig to my shop with some basic problem. He wanted to know when I would work on it. I told him we were pretty well caught up...
  5. Pins 1,2,3 are just a gain stage, then the 0.005...

    Pins 1,2,3 are just a gain stage, then the 0.005 couples the signal from that plate to the grid of the phase inverter triode.

    6,7,8 is the phase inverter, a plain old split load type. 0.005 caps...
  6. There is no real way to test parts on the bench...

    There is no real way to test parts on the bench for "shutting down after they warm up 10 minutes". All a shop can do is test them statically for function.

    Same with the woofer, no way to test for...
  7. Replies
    31
    Views
    520

    Remove the op amp IC. Does signal now appear at...

    Remove the op amp IC. Does signal now appear at pin 6 of the tube?
  8. And just to follow up, yes there is still 100k...

    And just to follow up, yes there is still 100k between the two points. You are measuring the path down through 100k R22 and back up through 680 ohm R25.
  9. Replies
    1
    Views
    91

    Look on the part, the value is likely printed or...

    Look on the part, the value is likely printed or stamped right on it. Even though it spins, you can still probably measure the element resistance.
  10. Replies
    17
    Views
    449

    Cathode resistor?

    Cathode resistor?
  11. When I suggested 100k, it was pretty arbitrary,...

    When I suggested 100k, it was pretty arbitrary, the idea being sub SOMETHING in there and see if it works. If it is 100 ohms, fine, though that seems a very odd value for a volume control.
  12. Two steps: 1. find out what it is. 2. ...

    Two steps:

    1. find out what it is.

    2. find a replacement.

    So do you have some pots in your shop? I would solder some wires to a 100k pot and tack it into the circuit. Does it work? If...
  13. Replies
    15
    Views
    415

    Um, I just woke up...and I am old... but that...

    Um, I just woke up...and I am old... but that sounds wrong to me. If they share a common cathode resistor, one red plating tube carries way more current, that increases the voltage drop across the...
  14. Replies
    8
    Views
    392

    You can't just count gain stages. Looking at the...

    You can't just count gain stages. Looking at the 30 schematic, leaving V2b there is a 470k/150k voltage divider dropping signal level. Then leaving V2a, there is another voltage divider across the...
  15. Replies
    9
    Views
    319

    That is what a one-shot does. You trigger it,...

    That is what a one-shot does. You trigger it, it gives you one pulse, then you have to trigger it again to get any more from it.

    A one shot is also called a mono-stable multivibrator. Very...
  16. Replies
    9
    Views
    319

    No, but a very basic one-shot controlled by your...

    No, but a very basic one-shot controlled by your stomp switch will handle this.


    Many if not most digital effects and such are edge triggered, meaning it is the falling voltage, not the end...
  17. Replies
    8
    Views
    305

    I tell them that I have a warranty on my shop...

    I tell them that I have a warranty on my shop work, but a warranty is no the same as insurance.
  18. Thread: LED question

    by Enzo
    Replies
    21
    Views
    604

    That means the diode has a forward drop of...

    That means the diode has a forward drop of 2-2.5v, just as a 1N4007 has a forward drop of about 0.6v.

    You determine what it draws. Consider the 2v forward, then consider the power supply. You...
  19. Oh well, they still may have loose bulbs.

    Oh well, they still may have loose bulbs.
  20. Peterson has entire bulb boards in stock for $24....

    Peterson has entire bulb boards in stock for $24.

    https://www.petersontuners.com/shop/item/Replacement-Neon-Lamps-for-Vintage-Tuners

    That reinforces my idea of contacting them for just the...
  21. I know I still have some, but they are buried in...

    I know I still have some, but they are buried in my storage unit.

    I would contact Peterson, who bought out all the old Conn strobetuner stuff. I think they have passed it along since, but they...
  22. Replies
    49
    Views
    11,295

    The diodes are already grounded at the one end. ...

    The diodes are already grounded at the one end. SO put a cap in parallel with them, and one end will be grounded as well. So essentially, just stick the cap in parallel with one of the diodes.
  23. You look for voltages with a volt meter. ...

    You look for voltages with a volt meter.

    Certainly a meter will find unwanted DC on op amp pins. It will also find low power supply voltages. Your particular meter may or may not measure riple...
  24. IC1 is the whole circuit, so look at the output...

    IC1 is the whole circuit, so look at the output pins - the corners - and see if any are stuck on DC.

    The IC runs on 15v supplies, so check those for ripple and voltage.
  25. Replies
    4
    Views
    246

    Fair enough on the name. I admit I do get a TON...

    Fair enough on the name. I admit I do get a TON of PMs asking for something or other from a decade old thread, often from members with post count of zero.
  26. Replies
    4
    Views
    246

    Oh come on, what do they pertain to and who...

    Oh come on, what do they pertain to and who helped?
  27. Replies
    15
    Views
    443

    If the plate node is grounded by a shorted diode,...

    If the plate node is grounded by a shorted diode, that doesn't leave any full B+ at the screen node.
  28. Replies
    5
    Views
    335

    There is the answer. You said it up top, they...

    There is the answer. You said it up top, they neglected to grind away the nearby copper. SO grind it away yourself. If you ever have an arc, and there is not enough copper to grind away, then cut...
Results 1 to 28 of 484
Page 1 of 18 1 2 3 4