1967 Prototype Park

Discussion in 'Let's Talk Vintage' started by kuli, Oct 3, 2016.

  1. kuli

    kuli Member

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  2. pleximaster

    pleximaster Well-Known Member

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    I is so F@cked up inside with those boards.

    I got one orange in used but original condition see my avatar.

    Plexi

    You can come over the bridge and play it some time!!! It's not that far
     
  3. neikeel

    neikeel Well-Known Member

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    It looks original to me.....................
     
  4. pleximaster

    pleximaster Well-Known Member

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    Printed circuite in 67 Marshall? Yes Wiring looks ok but PARK were used to use up old stock... never heard of them doing it the other way around. But I could be wrong, I just saw printed board and my instinct said NO!

    I have a new amp at home... so I don't pay so good attention... :) :) :)



    plexi
     
  5. TAZIN

    TAZIN Active Member

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    I seen a '69 Marshall 50w a couple of years ago that had the preamp sockets set into the chassis much like this amp. Unfortunately, there were no pictures of the underside of the chassis to verify a pcb but if I were a betting man I'd say there probably was after seeing this '67 Park. The 50w was from April '69 I believe.
     
  6. kuli

    kuli Member

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    It sure does look original, but have never seen anything like that before..
     
  7. BowerR64

    BowerR64 Well-Known Member

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    WHen i took electronics class in high school we made our own boards using "etched solution" you used a special marker and actually drew the traces on the copper. Then you dip them into some kind of a solution and it etched away all the copper sept where the marker was. IMO a HUGE waste because only a small % of the copper was used. After that we had to drill the holes by hand to put the components threw the top side.

    These boards look just like those we made back in the 80s im sure the technology goes back further though.

    I dont remember exactly how we drew the trace lines on the board if we used stencils or what. I remember i got an extra board and putting F_CK! on one of them and etching everything away sept the profanity. Then some kid stole it from me :confused:
     
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  8. JeffH

    JeffH New Member

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    I thought the one on ebay was weird, too but then I saw another on Reverb with the pre's through the chassis and a PCB (or two) inside.

    https://reverb.com/item/3156064-1960-s-park-white-tolex-head

    The one on ebay is in England, not sure if the seller is affiliated with the notorious Harrisons or not.
     
  9. mickeydg5

    mickeydg5 Well-Known Member VIP Member

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    If it was not documented it means nothing whether real or not.
     
  10. Goldtop916

    Goldtop916 Member

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    I found a 3rd Head like the 2 Park 150w "Plexi" on Eaby and Reverb so I add here 4 pictures of each for comparison as there are few differences between them.

    Only information I found about the Print circuit board are in the book "The history of Marshall, the first 50 years" from Michael Doyle and Nick Bowcott. They said on the page 333 the following: At first the EL34 valves in a Marshall 50 were placed with KT88s, and the subsequent model became known as the "Park 75" while Park heads built with four KT88s were variously known as "200s" or "150s" depending on the model and year. Some Parks were also made with preamp valves mounted directly on the PCB, which made the amp easier to manufacture, but this design wasn't pursued, and most amps were made in the conventional manner".

    However there is no info about the year they did them and how many were built with PCB.

    Picture from Ebay & Reverb
     

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  11. Goldtop916

    Goldtop916 Member

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    Ebay SN 427, Reverb SN unknown, new one SN 352

    Now about the difference I found:
    The one on Ebay is probably a PA model
    It has no choke on the top of the chassis but 2 other have it
    PCB is not the same as 2 other too
    The place where the plexi on the back is cut is different on all of them
    The wires used different colors, not consistent.

    Thanks to let me know if you have more information about this type of amps, I would appreciate to learn more
     

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  12. Goldtop916

    Goldtop916 Member

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    No one has info on this Park amp?

    Perhaps some of you can answer these questions:
    Is electronic circuit same as a Marshall Pig or Major or other Marshall?
    Where are the difference that make this Head 150w and Marshall with 100w or 200w?
    Which one of the 3 electronic circuit above look like unmodified or less modify than other and why?
     

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