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  1. I had some time to begin the Meter Calibration...

    I had some time to begin the Meter Calibration procedure on this Weller EC2002A Soldering Station. I needed some small pins to fit into the soldering iron socket, and found I had some crimp...
  2. Of course Marshall receives their transformers in...

    Of course Marshall receives their transformers in qty, all well packed, on wooden pallets, sturdily boxed, with separations inside to keep all safe from damage. But what you received from some idiot...
  3. I looked at the fit of other molded Stereo RCA...

    I looked at the fit of other molded Stereo RCA cables I have on hand, and they stick out too far. I'm none to fond of the old RCA connectors we used to see Fender using decades ago on their foot...
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    Every time I'm forced to open up either of my...

    Every time I'm forced to open up either of my Fluke 8060A, I shudder, as those molded screw bosses have one by one split apart, beyond trying to attempt gluing back together, since they turn into a...
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    THAT ^^^^^^^^^^^. I too have had issues with the...

    THAT ^^^^^^^^^^^. I too have had issues with the shield connections in the wiring harness. Tedious to chase down with all the discrete wiring.
  6. Another late generatoin Fender combo amp with molded spkr plug issues

    After having serviced this relatively new Fender Princeton Reverb just last month, where the Reverb wasn't responding, and after eliminating the tiny crimp connectors that plug on to the tank's xfmr...
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    Sorry....I hadn't looked at the website link, and...

    Sorry....I hadn't looked at the website link, and missed the discrete bridge saddle solution.
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    Were the original 10 ohm 1% cathode resistors...

    Were the original 10 ohm 1% cathode resistors replaced? Over the years, Ampeg has used a few different brands, but have always used tight-tolerance 10 ohm 2W resistors for R35-R40. If they were...
  9. No doubt the engineering prototype looked cool,...

    No doubt the engineering prototype looked cool, and somebody on the engineering team had some 'brilliant' justification for it, and caught the bean counters and above in a gullible mode, so now we...
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    NO....the individual saddles are still metal on...

    NO....the individual saddles are still metal on metal with the tailpiece, so all of the bridge pieces are at same ground potential. Just need the one ground wire to contact the tail piece.

    Nice...
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    I've never had to troubleshoot the PWM power...

    I've never had to troubleshoot the PWM power supply module that samples the audio and controls the supply voltages by ramping them up and down at nearly 1MHz rate, so minimum voltage across the power...
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    Class 1 Precision Integrating SLM

    I too use a Sound Level Meter all the time. I've been addicted to Class 1 Precision Integrated SLM's, which tend to be expensive if you buy them new. The last one I found, a Rion NA-61, was similar...
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    Ampeg Tech Info Bulletin # TIB003 June 2001 Screen resistor/diode networks

    55159

    Following Ampeg's recommendation per TIB003 attached.
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    We have #187 of 500 of this 1987 SVT LE in our...

    We have #187 of 500 of this 1987 SVT LE in our rental inventory. I haven't had to do any serious maintenance on it thus far (apart from replacing the screen resistsors with 220 ohm 1W, removing the...
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    Single fan, not even high velocity from what is...

    Single fan, not even high velocity from what is available in 80mm fans. Short protection? While I'm used to seeing that in most solid state amps, I haven't found any in the chassis nor in the...
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    Problem found.....solder joints again!

    Twice now I both briefly saw full output at 4 ohm load, and heard a faint click, after which the upper half of the output waveform was severely clipped. So, pulled the module back out, and went...
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    Scope waveforms of positive drive problems

    After removing the 47 ohm emitter resistors I tried earlier, restoring the 100 ohm values for R26/R28, I went to remove the miller cap C9 to replace it, just in case that was involved. Eden's PCB...
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    I found the typo in the explanation, and...

    I found the typo in the explanation, and corrected that. I'm using 2 pairs of the MJL21193/MJL21194, not one pair. Much like the original version using the two pairs of Sanken 2SA1494/2SC3858. ...
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    Eden WT-800C Clipping problem

    I have an Eden WT-800C on the bench, with one of the two power amp modules having two pairs of MJL21193/MJL21194 pwr xstrs in place of the three pairs of 2SA1492/2SC3856 pwr xstrs. Under 4 ohm load,...
  20. Finished Heater Coil assy, hi temp insulation, mesh screen for Heat Gun

    Finally finished restoring this heat gun! The Hi Temp Mica paper arrived last month, and today, the Stainless Steel fine mesh screen material arrived (23AWG, 0.085" square pitch) which the gun...
  21. Are you wiring for 230V or 240V? Either way, you...

    Are you wiring for 230V or 240V? Either way, you do have J33 and J34 available for the unused terminals of the Power Xfmr, and J23 & J24 for the unused terminals for the Filament/Screen xfmr. So,...
  22. Reading the chart and looking at my Relay wiring...

    Reading the chart and looking at my Relay wiring diagram, it appears the upper primary has 4 wires, while the lower primary has three. Upper coil: WHT is 0V, Blu-Wht is 100V, BLU is 110V, BLK is...
  23. I hadn't mentioned the solder joint issues with...

    I hadn't mentioned the solder joint issues with those 4mm spaced Molex headers that are used all over the amp. What you found on the bottom of J6 (V+FIL/V-FIL) connector is NOT uncommon over time. ...
  24. OK...sorry for being so specific in what controls...

    OK...sorry for being so specific in what controls the Power-up circuits in this amp. Let me know if you need any assistance, as I know these units well.
  25. I've always had great luck with the larger F & T...

    I've always had great luck with the larger F & T caps. This is the first time I've seen their full line electrolytic catalog. Though they don't appear to offer smaller values for use in cathode...
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    Do you know how to check transistors & diodes...

    Do you know how to check transistors & diodes with a multimeter? Most current models have a Diode Test mode, which normally provides a 1mA constant current source with a 2-3 volt potential behind...
  27. Nichicon VX Axial electroltyics EOL, other mfgr's now vanishing?

    While on Mouser's website ordering supplies, I went to see what I could find in Nichicon TVX series Axial Electrolytic caps. gbono had made the announcement of Nichicon's TVX series became EOL...
  28. See what you have on the two zener diodes D27 &...

    See what you have on the two zener diodes D27 & D28 on the main power amp PCB (either with the power tube PCB out of the way), or on pins 2 & 3 of the Preamp's 5-pin power supply connector J4. Pin 1...
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