Elgen amp Humble Pie!

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Elgen amp Humble Pie!

Postby moon'nwillie on Mon Feb 01, 2010 3:16 am

Hey all, I sold my Music City (thanks valvelust) and am now buried in my Elgin. I opened it up before powering it up and have a few questions...what the heck is the trim pot on the top of the chassis....it may be just a screwed in coil? Bias adjustment in on the board, presence is on the control panel. This control (or coil...fuse..whatever!) comes from the output tranny and ties in with one of the filtering caps...any ideas guys? I've seen primitive top mounted fuses on vampowers..is that what this is? Also, partridge trannys but no voltage selector...red primary is covered in tubing as shown....would you guys convert it to 120 or leave it alone? if so...any suggestions on how?ImageImage ImageImageImage
Last edited by moon'nwillie on Tue Feb 02, 2010 2:21 am, edited 1 time in total.
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Re: Elgin amp Humble Pie!

Postby Gooch on Mon Feb 01, 2010 5:00 am

Could it be a hum balance pot like on the old Ampegs? Does it tie into the heater supply?
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Re: Elgin amp Humble Pie!

Postby tracynorton on Mon Feb 01, 2010 2:45 pm

I have schematics of a couple lead 100s.
That doesn't appear, so if you can take a couple good, hi-res pics of the tagboards and overview (i mean 300dpi or better) and take a DMM, set it to ohms, and point out where the tabs of that 'coil trimmer thingy' connects to....and I can prob make a formal sch for you

Go to http://sites.google.com/site/tnortoncad/ and there's a Lead100 sch there, but it represents another member's amp here....
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Re: Elgin amp Humble Pie!

Postby Baron Von Machinenmann on Mon Feb 01, 2010 8:54 pm

Looks like a mounting screw rather than a trim adjust. Baby choke? :dunno:
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Re: Elgin amp Humble Pie!

Postby Gooch on Mon Feb 01, 2010 9:41 pm

Baron Von Machinenmann wrote:Looks like a mounting screw rather than a trim adjust. Baby choke? :dunno:



It does look a little like the grid current resistors on the old Marshall Majors.
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Re: Elgin amp Humble Pie!

Postby Baron Von Machinenmann on Mon Feb 01, 2010 10:23 pm

Like these? Why only one?......


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Re: Elgin amp Humble Pie!

Postby DaveW on Mon Feb 01, 2010 10:52 pm

These are old high wattage resistors, I used to use these when I was an apprentice TV engineer to drop AC to create a higher voltage on tube filaments (to give them a bit more life). I worked for a cheap TV rental company. They would be often mounted on a screw rod to create custom AC mains droppers).

see half way down this page:

http://www.partridgeelectronics.co.uk/resistors.htm
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Re: Elgen amp Humble Pie!

Postby moon'nwillie on Tue Feb 02, 2010 2:29 am

The electronic article in question is rated at 15 amps...yikes...it is tied into one leg of an electolytic cap. The other legs feed to pin 3 of all el34's...there is a 220 ohm resistor between source and all pin 3's. Another leg runs to the output transformer. I am baffled. Anyway....I am waiting on clarification before powering up lest I smoke something in error! Thanks for the schems Tracy.....I went over them and this was not there, thought the way it is dressed and shrink tubed indicates it is 100% stock. On another note......any ideas on converting this to 120v?
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hiwatt sa 212
orange or 80 combo
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Re: Elgen amp Humble Pie!

Postby ragtweed on Tue Feb 09, 2010 1:28 am

Rock On!
I got my mojo workin'
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Re: Elgen amp Humble Pie!

Postby Pink Zeppelin on Tue Apr 27, 2010 1:10 am

What is the difference between this one and yours?
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Re: Elgen amp Humble Pie!

Postby moon'nwillie on Tue Apr 27, 2010 5:32 pm

Pink Zeppelin wrote:What is the difference between this one and yours?
Well, mine is a earlier plexi panel version. Knobs on mine are 100%...can't say about what is on that one. More importantly, his is for sale and mine isn't! I saw that one on ebay as well....wonder if he gets his price.
64' bluesbreaker
65 18 watt marshall
lots of colored marshall!!
65 vox ac-15 twin
hiwatt sa 212
orange or 80 combo
watkins scout
selmer croc thunderbird
moon'nwillie
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Re: Elgen amp Humble Pie!

Postby Pink Zeppelin on Tue Apr 27, 2010 7:41 pm

Actually, "he" is "me", that is my amp. I have no idea what it is really worth because no one seems to have much info. Mine has no presence control, and the volume is concentric. It has been serviced/tubed, but the parts are original. I spent years searching for a matching 4X12. I found a really ragged blue one, but that was it.
Any other info you can provide would be appreciated. As I said, I really don't know what it's worth, only that it is very rare, in great condition, and sounds awesome.
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Re: Elgen amp Humble Pie!

Postby EDBIG on Wed Apr 28, 2010 2:57 pm

The mystery part is a ballast resistor and acts as a choke.
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Re: Elgen amp Humble Pie!

Postby Pink Zeppelin on Thu May 13, 2010 1:57 am

Here are some gut shots
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Re: Elgen amp Humble Pie!

Postby thornybank on Sat May 15, 2010 10:03 pm

Had one like yours.
Only one, and I have been amping since around '83.
Never plugged it in - turned it over to a 'one of each' collector after about 10 years.
Has enuff iron in it to suggest a full bore output.
I will watch for comments on tonality....
Cheers!
Shut that thing off and get to bed!
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