Park JTM 45/100

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Park JTM 45/100

Postby buttshaker on Thu Feb 25, 2016 7:52 am

Hi to everybody,

5 or 6 years maybe that I hadn't come here...but today is quite a special day.
I found an amp. Not a big deal, I I run through quite a lot of amps, but here....

Found it in a kinda flea market / pawn-shop / garbage zone, burried under other stuff...

Here on the back seat of the car...

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Yup !! What's that ?

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Well, someone didn't like the off-set Park badge on the top left corner, so re-mounted it on front center. I'll put it back where it belongs one of these days, although I quite like it like that. The amp has battle scars everywhere. Rough edges, broken handle...Believe me, it is in glorious Rock'n'Roll shape. To me, there's nothing more beautiful than amps that have seen a lot of action. I don't like mint amps, personnal taste here.

So what we got?

Well, it's a 1966-1967 Plexi-Park in full glorious 100 watts.

Image
Last edited by buttshaker on Thu Feb 25, 2016 4:00 pm, edited 4 times in total.
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Re: Park saved.

Postby buttshaker on Thu Feb 25, 2016 7:53 am

Serial number 117 BASS !!!!

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With the huge tall power tranny, "Fat" OT, no-cap-on-top etc. Cobwebs everywhere. You can tell this is not MG fake :-D

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The amp only has two original knobs left, it seems.

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Tomorrow, i will open it up, check it, and post pics.

Shaker
Last edited by buttshaker on Thu Feb 25, 2016 8:41 am, edited 1 time in total.
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Re: Park saved.

Postby Kuli on Thu Feb 25, 2016 8:31 am

Wow concrats on a nice amp!! Looks like a Park-version of a JTM45/100 from 1966 - that means output tubes should be KT66's.
'66 JTM 45
'66 JTM 45/100
'68 1959T Super Tremolo
'69 1987 Lead
'69 Royal Purple 1960B basketweave
'70 4x12" Park blue basketweave
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Re: Park saved.

Postby buttshaker on Thu Feb 25, 2016 8:37 am

Hi Kuli, yes you're right...That's what i'm wondering too. I had two Jtm 45/100 and still have one, the PT looks virtually the same, as does the OT. And the "100V" output selector...same.
I will have to enquiry deeper here. At first glance, without removing the chassis, I haven't seen any number on the transformers. Will see when I will slowly Variac-it, I will be able to tell by checking the B+ voltage...insane on the 45/100's.
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Re: Park saved.

Postby appetite4distortion on Thu Feb 25, 2016 10:25 am

Yes, that's it.
Drake 1204-43 power transformer (3” stack) and OT Drake 1202-84. You should get about 560V B+ there.
That's some bad ass amp for sure. Waiting for the inside pics :cheers: 8)

PS the sylvanias 6550 looks to me? Slam some KT66 in there!
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Re: Park saved.

Postby buttshaker on Thu Feb 25, 2016 10:35 am

Nope, 6CA7. Killer tubes, btw !
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Re: Park 45/100 ??!

Postby LD50 on Thu Feb 25, 2016 12:36 pm

It's all dirty and dusty and needs some GEC KT66s, if it is taking up too much room you can send it to me! :wink:
All bleeding stops.......eventually.
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Re: Park 45/100 ??!

Postby drewleslie on Thu Feb 25, 2016 12:43 pm

Noce!!!
How can you tell the difference between a chemist and a plumber? Ask them to pronounce 'unionized'.
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Re: Park 45/100 ??!

Postby buttshaker on Thu Feb 25, 2016 3:57 pm

Hi gents,

Ok I dismantled it. Quite hard, rusty screws and all, you get the picture.

And the verdict is.....

It IS a Park JTM 45/100

Well in my book, a Marshall JTM45/100 is ultra-rare. What can I say about a Park JTM45/100 ? Ultra-obscure ? Almost non-existent ??

And...I have had two 45/100, both in the 7000-7200 Serial # range. Both have aluminium block ends, and numbers on trannies. But I have worked on a few others, in the low 6700-6800 #, that had no block ends and no numbers on transformers.

And this one....is full aluminium, with NO block ends, and NO numbers on transformers. So it is a very, very early 45/100 anyway.

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EDIT : Topic title edited. It is now 100% obvious :-)
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Re: Park JTM 45/100

Postby strato2009 on Thu Feb 25, 2016 4:35 pm

That's a monster amp :cheers:
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Re: Park JTM 45/100

Postby Humbucking on Thu Feb 25, 2016 5:29 pm

Here is mine. The weight of the HUGE transformers bent the chassis & I cannot fit KT66s in now. It sounds insane with EL34s, so I will keep it this way. Trying to bend the chassis back will require removing the circuit board & I just don't want that brain damage. Congrats on the amp! Image
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Re: Park JTM 45/100

Postby Michael Patrick on Thu Feb 25, 2016 5:40 pm

Shaker, you gotta flip that chassis over and show us the naughty bits! :thumbsup:
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Re: Park JTM 45/100

Postby buttshaker on Thu Feb 25, 2016 6:43 pm

@Humbucking : ah, cool ! I tried hard, dug a lot, but couldn't find any other Park 45/100, except one mention on TGP...Mine is starting to bend too. We can clearly see the PT moving a bit. That's why it has two bolts on the left side maybe :

Image

@Michael Pat : Yes, I know everyone wanna see the guts :-). Those were the appetizers..:-) I'll put them in a couple hours, have to go outside to diner !
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Re: Park JTM 45/100

Postby Kuli on Thu Feb 25, 2016 7:22 pm

AWESOME!!
'66 JTM 45
'66 JTM 45/100
'68 1959T Super Tremolo
'69 1987 Lead
'69 Royal Purple 1960B basketweave
'70 4x12" Park blue basketweave
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Re: Park JTM 45/100

Postby buttshaker on Thu Feb 25, 2016 9:07 pm

Ok here are the guts !

As you will see, it has had (I guess) only one major job during its life, on cap board - 5 caps replaced, with french early 70's capacitors mainly. Also, two pots...where the knobs have been changed. The old knobs must have not been of the same diameter as the new pots, too bad. I have an interrogation on the standby switch.

Other than that...it is virgin clean !! Original screen resistors, preamp board fully untouched (an interrogation on a cap that seems to have been added on the feedback resistor EDIT: - may be original, to allow more bass, hence the "BASS" name on back !?), bias untouched (it seems, not 100% sure here looking at the old solder).

My guess, it rocked the hell out on a lot of scenes, scraping the edges and all (I'll take a pic of the undercab...impressive rock'n'roll life) until it blew a tube or was less efficient in the mid-to-late 70's, where a tech changed the power caps and two pots, and put Sylvania 6CA7 on it - he may have had trouble locating KT66s. Then it rocked the scenes again, losing the white jack nuts, cracking the (already replaced) handle...etc...'til retirement.
Considering the outside look of the amp, the inside is supa clean.

Here it is :

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Last edited by buttshaker on Thu Feb 25, 2016 9:45 pm, edited 1 time in total.
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