12002: 2" OT

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vanhalen5150
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12002: 2" OT

Post by vanhalen5150 » Mon Mar 28, 2011 7:45 am

Thought I'd start a thread for this from the begining. Although most of the info can seem redundant, there are always new things and ideas that can arise.
From other threads there seems to be split ideas as to the orientation of the OT. I have noticed some of George's OT's have the orientation as seen here I believe. Is there a difference? Does it matter?
Keep in mind the OT is a 2", therefore a few extra holes in the chassis. Also note the Larry grounding, with a straight alignment under the board as Vhjunkie suggested. 2" OT, 12000 series PT from ****** Audio. Choke is a Mojo Plexi/JCM 800 3H.
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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by vanhalen5150 » Mon Mar 28, 2011 8:06 am

One of George's builds:
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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by Strat78 » Mon Mar 28, 2011 9:52 am

I think it was Night Owl that did it in reverse (by mistake?), which is how I have my first 68 build. The one I'm breaking in now (like yours with the *****tranny's), is positioned like George's. The tranny's should be mounted on Lazy Susan's so we can rotate them to the optimal positions on the fly! Also, you should add one more of those solder lugs to grounds #1 through #4, which will make things easier and less crowded.

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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by vanhalen5150 » Mon Mar 28, 2011 10:25 am

Yeah, thats how mine is as well from the build last year. I followed those same directions. I have the #1 and #2 lugs there as well for the grounding to the left. Total of 5 lugs. Do you mean to add another?
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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by Strat78 » Mon Mar 28, 2011 10:38 am

I mean the little tab things you solder the wires to for each ground possiton. You should have two for each ground bolt so you don't have to crowed all those ground wires on to one tab.

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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by vanhalen5150 » Mon Mar 28, 2011 10:41 am

Strat78 wrote:I mean the little tab things you solder the wires to for each ground possiton. You should have two for each ground bolt so you don't have to crowed all those ground wires on to one tab.
Ok, gotcha.
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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by vh junkie » Mon Mar 28, 2011 11:59 am

A couple of things about the lugs:
They are easier to solder if you don't tighten them down until the end.
If you read Larry's thread(s), there should be an external tooth lockwasher between the lug(s) and the chassis.
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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by vanhalen5150 » Mon Mar 28, 2011 12:23 pm

vh junkie wrote:A couple of things about the lugs:
They are easier to solder if you don't tighten them down until the end.
If you read Larry's thread(s), there should be an external tooth lockwasher between the lug(s) and the chassis.
Even though the lugs are "toothed" already?
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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by vh junkie » Mon Mar 28, 2011 1:16 pm

"With all due respect, sir, you're beginning to bore the hell out of me."
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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by vanhalen5150 » Mon Mar 28, 2011 1:23 pm

Ok, on the other side(outside/up) of the chassis I have a regular brass washer between the screw and the chassis. Should that be removed, with just the screw going in first? Not a big deal I suppose, but I would suspect you want the least number of unsoldered contacts stacked there.
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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by vh junkie » Mon Mar 28, 2011 5:10 pm

Screw, flatwasher(optional), chassis, external tooth LW, Lug, Lug, Nut - that's the way I read it.
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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by Strat78 » Tue Mar 29, 2011 12:25 am

Perhaps the type of lug Larry is talking about do not have the locking teeth built on. I can't think of a reason why it would matter having the extra washer with teeth other than to totally dig into the chassis to form a strong connection, still I'm going to redo all my grounds with the additional tooth washers! :mrgreen: Great stuff!

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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by vh junkie » Tue Mar 29, 2011 6:24 am

I think that's the reason. The chassis might have oxidation on the surface. The teeth dig in to the bare metal.

On mine, I left the grounds to the preamp board a LITTLE long, and on their own lugs, so I could lift the board enough(on the pot side) to release the lug nuts. Once the nuts are off, the pot side of the board will rotate up enough to do mods on the bottom. The power amp board the same thing, but it rotates upon the tube side.
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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by vanhalen5150 » Tue Mar 29, 2011 6:57 am

I used a Dremel around the holes.
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Re: 12002: 2" OT, Lar/Mar, ZLEFX

Post by vanhalen5150 » Tue Mar 29, 2011 7:26 am

vh junkie wrote:I think that's the reason. The chassis might have oxidation on the surface. The teeth dig in to the bare metal.

On mine, I left the grounds to the preamp board a LITTLE long, and on their own lugs, so I could lift the board enough(on the pot side) to release the lug nuts. Once the nuts are off, the pot side of the board will rotate up enough to do mods on the bottom. The power amp board the same thing, but it rotates upon the tube side.
Hey Robert, that's a good idea. This is why things that seem redundant still bring out different ideas that are usable to impove on things.
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