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  1. N

    Your Marshall wish list

    I’m pretty sorted! 65 JTM45 original Then my builds: 66 45/100 JH clone 1987/2204 switchable 18w Trem 2x12 18w TMB EF86 1x12 Cabs are key too: 69 1982B 69 1935A If I had to add to another I’d grab my sons 1992/2203 2 in 1 with 6550s but he would put up a fight. Regarding other originals...
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    Should I buy this JMP 2204?

    The coupling caps are original and date the amp to early 77 (I had a JMP50 Model 1987 with them and it ripped!). They work very well and I have had no issues with them, others have commented that they can be mechanically fragile if you throw the board around (why would you) and I would certainly...
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    Orange-Matamp ORST (50w) clone - UK - sold

    I’ll email this evening after work with pics of what I have.
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    Should I buy this JMP 2204?

    Yes it is Quick way to tell is of there is 300k on cathode follower plate supply This has a 'new' 100k which means it may have been converted but the V1 cathode components look original so may be just replaced part The wiring around the jacks is typical 2203/4 cascaded type
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    Wanted: Celestion T1281 G12H30-55 Hz 16 ohm single speaker in decent shape

    I can sell you a quad of ‘73 pulsonic coned G12H55 T1886 that I am about to mark for sale in a really rare ‘73 front loaded A cab. Dollar pound is good but shipping bad!
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    Finally…Plexi 100W in collection (paging the experts)

    Sounds fabulous- spot on. Hmmm. I’ve not had a coily cable for years!
  7. N

    Orange-Matamp ORST (50w) clone - UK - sold

    Very nice. Lots of work there. I do have one chassis and a set of iron left with pots, caps, resistors, selectors, lamp etc. Send me pm if interested
  8. N

    Where to find Iskra or Piher resistors

    True I’ve had a couple of 1970 amps (one was presented here couple of years ago) that used UPM50 Iskras -specifically 220k and couple of other values. But it is a bit like the Hystabs and Bumblebee vs long skinny Pihers around 64/65 in Marshall’s.
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    Where to find Iskra or Piher resistors

    Pretty sure I sent a link to Al (aka Whazzagroover) in Italy. He sells full and short length Pihers. The short ones are perfect for Marshall turret boards and cheaper. I’ll find the link again. I have only a few of those value Iskras and would have difficulty replacing them. The guy in Sweden...
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    Dave Friedman's 50w Plexi

    I guess they are going with what works - works! It often surprises me that very experienced people are not clued in about the layout/history spec of really classic amps (Uncle Doug's JTM45 video was another example). Not worrying about filter caps that are working 100% does not surprise or...
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    '67 Marshall "Power builder"

    I’ve never seen one. Would love to find a bunch, save one for historical purposes and the rest for building some amps!
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    4700/5000 ceramic bright-cap

    They do crop up reasonably frequently but most vendors are aware of value now and less of them are embarrassed to ask silly money. As Matthews Guitars pointed out the best chance is a radio ham (or their estate) having a clear out.
  13. N

    4700/5000 ceramic bright-cap

    I had a bundle that I robbed from an old early 70s 100w PA head but have used or given them away.
  14. N

    1967 JMP 50 circult

    It all looks to have been done very professionally and tidily, no issues with quality of work or parts but yes definitely modded.
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    1967 JMP 50 circult

    Summary: late 67 Bass/lead or organ originally Replaced switches and lamp Replaced filter caps and boas caps Added screen resistors and grid resistors Output coupling caps replaced 0.1uF to 0.022uF Added 0.68uF cap over V2a cathode Replaced output tube sockets So partly modded to lead spec but...
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    Drake 784-139 history?

    AFAIK the -139 is 3.4k primary and the -213 is more like 4k. I've had a couple but not measured them , n fact just remembered - I may have one in a 50w PA in a cupboard so can scope it/measure when I get chance.
  17. N

    Change filter caps on an 83 4010?

    I think that they are LCRs (there were the typical blue ones and some black ones).
  18. N

    Change filter caps on an 83 4010?

    LCRs, F&Ts and Dalys are all the same size and fit in 35mm clamps. Like scottster I found that the ARS are of slightly smaller diameter and need a couple of wraps of insulating tape to get them snug (I have a blue that is the same colour so if you trim it to size you cannot tell).
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    Doing a 1987 build?

    I like the parts supplied by Valvestorm to the old Metro specs. Best quality and you can follow the build instruction links on the Valvestorm site. Looks like the Heyboer transformers are the only ones to get (either generic or Marstran) It’s not quite ‘open the box and paint by numbers’...
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    Finally…Plexi 100W in collection (paging the experts)

    How’s production and shipping going with those? I hope the originals I sent were useful in matching the fonts, different colours and backing?

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