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Thread: Fender Deluxe Reverb Reissue Low volume issue

  1. #1
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    Fender Deluxe Reverb Reissue Low volume issue

    Hey Guys, I'm hoping somebody can help me figure out a volume output issue with a Fender Deluxe Reverb Reissue. My friend purchased it new in 2017 (build date 09-17) PCB version is 2002. He said it was working fine one day but he was pushing it a bit while jamming up north, he drove home after the jam session, put it away then the next time he tried to play it it had low volume. he tried swapping tubes. It didn't have any distortion, just low volume. he gave it to me and I did the following:
    1) tapped on tubes - no microphonic tubes
    2) swapped preamp tubes one at a time with another tube, then swapped out everything except the rectifier.
    3) ordered and installed new electrolytics ( it had IC caps and I have seen some of these fail with low mileage )
    4) inspected and resoldered practically every solder joint ( might have missed a few but everything looked good here
    5) started measuring voltages of all the test points..

    I found two points of interest when measuring.. the volume came alive when I was probing TP-25 ( R34) but when I tried messing with the solder joints in the area with a wooden chop stick the volume drop never returned. the second interesting behavior: I found a slight pop and volume increase TP-37 ( V7-3) and this one did drop the volume again slightly when I pushed the pin the other way so I suspect I need to re-tension this pin.

    Please see the voltage measurements below:

    Thank you in advance for your support!
    Last edited by CDHFX; 05-11-2022 at 12:53 PM.

  2. #2
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    Re: Fender Deluxe Reverb Reissue Low volume issue

    I apologize for the multiple posts.. having issues with the paste format of the table.. table is below in reply

  3. #3
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    Re: Fender Deluxe Reverb Reissue Low volume issue

    Fender Deluxe Reverb Reissue Test Point Measurements
    Test point Location Conversion
    From mV to V
    Min Max Actual Unit Note
    TP-1 CP14 +396 VDC
    316.8 475.2 417 VDC
    TP-2 CP16 +394 VDC
    315.2 472.8 414 VDC
    TP-3 CP17 +311 VDC
    248.8 373.2 324.6 VDC
    TP-4 CP18 +261 VDC
    208.8 313.2 262 VDC
    TP-5 R69 -49 VDC
    -39.2 -58.8 -50.8 VDC
    TP-6 P21A-3 37 mVAC 0.037 0.0296 0.0444 2.46 VAC
    TP-7 C1 +1.3 VDC
    1.04 1.56 1.966 VDC
    TP-8 R4 1.6 VAC 1.28 1.92 47 VAC
    TP-9 P21A-5 47 mVAC 0.047 0.0376 0.0564 0.78 VAC
    TP-10 C11 +1.4 VDC
    1.12 1.68 1.78 VDC
    TP-11 R11 2.7 VAC 2.16 3.24 23 VAC
    TP-12 P22A-5 37 mVAC 0.037 0.0296 0.0444 2.46 VAC
    TP-13 C6 +1.3 VDC
    1.04 1.56 1.364 VDC
    TP-14 R16 1.6 VAC 1.28 1.92 128 mV AC
    TP-15 P22A-3 47 mVAC 0.047 0.0376 0.0564 0.55 VAC
    TP-16 R23 2.7 VAC 2.16 3.24 4.4 VAC
    TP-17 R26 1.9 VAC 1.52 2.28 2.6 VAC
    TP-18 C15 +7.1 VDC
    5.68 8.52 3.8 VDC
    TP-19 CP20 60 VAC 48 72 200 VAC
    TP-20 CP22 900 mVAC 0.9 0.72 1.08 3.9 VAC
    TP-21 R28 1.4 mVAC 0.0014 0.00112 0.00168 98 mV AC
    TP-22 C16 +1.4 VDC
    1.12 1.68 1.473 VDC
    TP-23 R29 80 mVAC 0.08 0.064 0.096 320 mV AC
    TP-24 R32 115 mVAC 0.115 0.092 0.138 258 mV AC
    TP-25 R34 3.8 VAC 3.04 4.56 4.2 VAC Volume increased when probing TP-25/R34 but could not get volume to drop again by probing R34 or surrounding components
    TP-26 R40 -.2 VDC -0.16 -0.24 -.24 VDC
    TP-26 R40 -6.8 VDC -5.44 -8.16 -7.5 VDC
    TP-27 C23 +1.8 VDC
    1.44 2.16 1.7 VDC
    TP-27 C23 0 VDC
    0 0 0 VDC
    TP-28 C24 11 VDC 8.8 13.2 19.3 VDC
    TP-28 C24 0 VDC 0 0 0.02 VDC ~0
    TP-29 R43 300 VAC 240 360 200 300V pk-pk
    TP-30 R45 VAC 0 0 0 waveform
    TP-31 R49 5.3 VAC 4.24 6.36 12 VAC 5.3V pk-pk
    TP-32 R52 1.9 VAC 1.52 2.28 0.9 VAC 1.9V pk-pk
    TP-33 R51 68 VDC
    54.4 81.6 51.8 VDC
    TP-34 R54 22 VAC 17.6 26.4 40 VAC
    TP-35 R55 23 VAC 18.4 27.6 43 VAC
    TP-36 R57 -37 VDC
    -29.6 -44.4 -37.1 VDC
    TP-37 V7-3 391 VDC
    312.8 469.2 408.1 VDC Pop and slight volume increased noticed when probing TP-37 / V7-3, pushing one way increased volume, pushing opposite way decreased, suspect that pin needs to be re-tensioned
    TP-37 V7-3 174 VAC 139.2 208.8 160 VAC
    TP-38 V8-3 174 VAC 139.2 208.8 160 VAC
    TP-39 J8 TIP 11 VAC 8.8 13.2 8.8 VAC

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