john hammond's Recent Activity

  1. john hammond posted a new thread.

    the hot damn hummer mod

    ok, so as described in another thread 4X12 8ohms and 4X12 16ohms question ? your...1966 1/2 ( whenever they started using those voltage...

    Forum: The Workbench

    Sep 20, 2019 at 12:20 PM
  2. john hammond replied to the thread 4X12 8ohms and 4X12 16ohms question ?.

    if someone here can express why i am wrong, and actually use a reason, or some terminology..then pls do so. mickeydog5, just talk...

    Sep 20, 2019 at 12:02 PM
  3. john hammond replied to the thread 4X12 8ohms and 4X12 16ohms question ?.

    [MEDIA]

    Sep 20, 2019 at 10:11 AM
  4. john hammond replied to the thread JMP 50W help to identify mods and replate issue.

    problem there is that if all the jacks have no connection to ground...what happens if there no lead plugged in at all? thats your worst...

    Sep 20, 2019 at 9:59 AM
  5. john hammond liked LRT#1's post in the thread dimebag.

    I miss both Dime and Vinnie

    Sep 20, 2019 at 9:48 AM
  6. john hammond replied to the thread 4X12 8ohms and 4X12 16ohms question ?.

    you are now. fender used it Musicman use it. Marshall use it. Vase use it. Holden wasp use it. Eminar use it. Valvetone uses it. Lenard...

    Sep 20, 2019 at 7:36 AM
  7. john hammond liked mickeydg5's post in the thread 4X12 8ohms and 4X12 16ohms question ?.

    Please note he will still tell you that it is a voltage doubler. Here is the schematic for your 1981 2203. Notice the stacked power...

    upload_2019-9-19_16-58-43.png upload_2019-9-19_17-4-52.png upload_2019-9-19_17-7-51.png Sep 20, 2019 at 7:14 AM
  8. john hammond liked Gutch220's post in the thread 4X12 8ohms and 4X12 16ohms question ?.

    so, can a schematic show the voltage doubling circuitry? I have a 1981 JCM800 2203 and would like to know if they used voltage...

    Sep 20, 2019 at 7:14 AM
  9. john hammond liked Gutch220's post in the thread 4X12 8ohms and 4X12 16ohms question ?.

    So every Marshall built after 1967 +/- uses voltage doubling? JMP's, 800's, 900's, 2000's, Jubes, etc...etc....? Is there anything we...

    Sep 20, 2019 at 7:14 AM
  10. john hammond liked mickeydg5's post in the thread 4X12 8ohms and 4X12 16ohms question ?.

    Yes. I have said that before. That does not mean I have no education/knowledge. I come to this forum because I like it, the people...

    Sep 20, 2019 at 7:14 AM
  11. john hammond liked Gutch220's post in the thread 4X12 8ohms and 4X12 16ohms question ?.

    I didn't read all 4 pages of comments so forgive me if this was discussed, but just buy a used Weber Z-Matcher for like $100 You can...

    Sep 20, 2019 at 7:13 AM
  12. john hammond liked mickeydg5's post in the thread 4X12 8ohms and 4X12 16ohms question ?.

    No, not voltage doubling. Marshall used the entire of HT secondary of 350-360 VAC of a higher wattage power transformer for the bridge...

    Sep 20, 2019 at 7:13 AM
  13. john hammond liked SmokeyDopey's post in the thread 4X12 8ohms and 4X12 16ohms question ?.

    :iough:

    Sep 20, 2019 at 7:13 AM
  14. john hammond liked mickeydg5's post in the thread 4X12 8ohms and 4X12 16ohms question ?.

    As I said before, go get educated.

    Sep 20, 2019 at 7:13 AM
  15. john hammond liked SmokeyDopey's post in the thread 4X12 8ohms and 4X12 16ohms question ?.

    I'm intrigued by John's passion on the subject. Is there a way to verify if it is in fact a doubler circuit? Can that be checked with a...

    Sep 20, 2019 at 7:13 AM
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