Impex loaded vintage

Pics, info, thoughts on old and/or hairy gear.

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Nick
The Artist Formerly Known As nightraven
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Re: Impex loaded vintage

Post by Nick »

Dear Philip,
Good to hear from you. I hope you're keeping well given these most unique circumstances.
I think I can accommodate your request in due course.
Kind regards Nick.
P.S. do you still like amp sims?
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Philip
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Re: Impex loaded vintage

Post by Philip »

Groovy.

They are handy.
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Doc Holliday
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Re: Impex loaded vintage

Post by Doc Holliday »

Good god the condition of that one is crazy good given it’s age
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Doc Holliday
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Re: Impex loaded vintage

Post by Doc Holliday »

Found a few more gutshots :freakout:
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Doc Holliday
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Re: Impex loaded vintage

Post by Doc Holliday »

Nick is yours an earlier model as it has those extra wima caps?
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Nick
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Re: Impex loaded vintage

Post by Nick »

Doc Holliday wrote: Tue Apr 07, 2020 7:33 pm Nick is yours an earlier model as it has those extra wima caps?
Yeah, those silver 5uF Wimas are remnants of the earlier MKII's, incl. some of the 'narrow knobs' Supas in the earlier enclosure. It seems like they ran out and moved onto those lil' blue ones during this particular era of Impex MKII's.
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Electric Warrior
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Re: Impex loaded vintage

Post by Electric Warrior »

It looks like they bought a large stash of parts for MK1.5s. They ran out of parts first, of which the MKII required a larger number.
Everything is transitional.
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Nick
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Re: Impex loaded vintage

Post by Nick »

Electric Warrior wrote: Tue Apr 07, 2020 8:37 pm It looks like they bought a large stash of parts for MK1.5s. They ran out of parts first, of which the MKII required a larger number.
I think they ran out of those silver Wima caps from the MK1.5-era very early on in the MKII production. The MK1.5's 5uF Wimas are in a slightly slimmer, longer cylinder, with slightly different print. I haven't looked through all of the data, but this seems extremely consistent among them, and so far I've only spotted those particular Wimas in one early MKII, which is Rafmax's 'narrow knobs' Supa (but there may be others).

You can compare the differences in the 'small board' MKII's, which have one of each type (and serves as even more evidence for them being "souped up" MK1.5's):

Image

BTW, don't we have a chatroom for this sort of thing? :badteeth:
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Radiotron
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Re: Impex loaded vintage

Post by Radiotron »

Another one for the archives.
Recently acquired ca. 1967 Marshall Supa Fuzz, Impex loaded, or so I thought...

It had some issues when it first got here.
After plugging it in I soon found out that one of the transistors was only barely passing any signal but produced a lot of noise :party:

Turned out to be Q1 with a gain of 7 and very high leakage.
In the process of tracking down the culprit, I flipped back Q2 and discovered a print trace on the can, turnes out its a Mullard OC81.

Just speculating here, but it does fit in with the theory that the Impex company might have been relabeling rejects from the Mullard production line.
The gain readings Dave once published years ago do seem like outliers, testing either very high or very low.
It's hard to find any reliable nformation on the Impex company (as a transistor manufacturer) but it sounds like a plausible theory to me.
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Doc Holliday
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Re: Impex loaded vintage

Post by Doc Holliday »

Great pictures
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