SW 1500

I am talking PS-2 3V.  Many of the ready to run set engine (steam), seen it in the PCC cars and some switchers.  Also some Diesel that just use a single sheet and screw through top.  G

I guess if you're talking stuff like the PCC, they don't expect much of a load on that board. I suspect that a one-sided heatsink is fairly effective.

I'd still like to find the part number for the diesel heatsink.

I guess so, the heat has to travel down the same leg to the frame.  Seems to work fine on the Diesels and RTR steam too.  G

GRJ:  Spoke to MTH today at York.  The heat sink you seek is used on the slave boards.  They did not have any here.  One yhing I did find is that MTH has 2/3 AA battery packs, much smaller than the full sized.  I found a box of them rummaging through the bins.

It would be great if MTH had a single parts manual.

I thought you were coming to York.

I bought some of the AAA packs, smaller than any of the others.

I'm making heatsinks out of 1/16 Aluminum, since I can't find the part number.

I'm sitting in the hotel at York typing this.

where di you get the AAAs? At York?

I'm also in hotel tonight, the Hampton east of Harley-D.

I order them direct from MTH, P# BG-4000004.

No, I meant where at York.  I was surprised to find 2/3 AA batteries at the MTH parts counter.  Got home tonight and find that these fit just right in the SW1500 as well as the 624.

Batteries are one of the common items that they do bring in quantity, stuff like Smoke wick, etc. are the staples of the parts at York.

Robert,  MTH doesn't have a stock number for those.  I think they had a shortage of the AA at one point and got those instead.  I  had one upgrade kit that had it.   G

FWIW:  I find the 2/3AA batteries have no problem keeping the sounds running after poweroff.  I guess MTH uses full-size AA to allow more shelf time before they're too dead to function.  From now on, when I do upgrades, that's the battery of choice.  I put them in the SW-1500 5- to 3-volt upgrade, and the 1954 Lionel #624 upgrade to DCS.

As a test, I put in the AAA pack and did an immediate startup and then killed the track power 10 times in a row.  They were still keeping the sounds running to the end of the shutdown sequence.  I suspect there is PLENTY of reserve in any of these battery packs. 

I think Stan calculated that the BCR has about 1/100 of the energy storage of the AA pack, and since a BCR works fine, it's hard to imagine any of these battery packs having issues.

I finally received today the Varta200mAH batteries I had ordered from Alibaba in China, too late to install in the locos I was working on since I had used 2/3 AA's.  The Varta batteries are quite tiny and are flat, so they could probably be glued under a car if need be or squeezed in somewhere.  I had not heard of Stan's calculation before, but if a standard AA is 700 mAH, these 200 mAH should be more than adequate. 

If anyone is interested, the battery is Varta # 2/200H, is 2.4 volts, is made in Germany and is NiMH.  I paid $9.49 each, shipping from Singapore included  Comes with an MTH style plug, of wrong gender to fit into an MTH harness.

{I corrected this post per GRJ's post next following}

The PS/2 board doesn't have the AMP style connector, are you saying it comes with a 3V board battery connector on it?

I erred.  Plug is identical, including gender, to the black plug on the 3-volt harness.

That's the plug I saw, so you'd have to replace that with the proper connector.