Larry -
No, the MS-4 (and MS-3) are both metal cabinets the same size as one of the twins. The MS-3 is
about an inch 'shorter' front to back. But either will hold an AC-3 or AC-4 with no problem.
Sounds like you have a non-original. There has always been a LOT of that, since speakers cost about
10% of what the receiver cost, and most hams had a speaker or two lying around.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Larry Sack wrote:
Garey,
I thought the AC-3 was not supplied with the MS-4 speaker. The one that came with my radio plugs
into a RCA jack pigtailed off the power connector. The speaker is a wood grain thing which would
never be able to hold the AC-3. I don't think it is original.
For cooling, I may wire up a fan(s) similar to what has been discussed here recently. I happened
across several old Apple Computer power switching devices that used to sit under monitors. They're
great.
Larry, N8QNM
*From:* Garey Barrell <k4...@mindspring.com>
*To:* Larry Sack <n8...@yahoo.com>
*Cc:* "Drakelist@zerobeat.net" <Drakelist@zerobeat.net>
*Sent:* Thursday, February 9, 2012 10:31 PM
*Subject:* Re: [Drakelist] AC-3 Covering
Larry -
Perhaps I misunderstood your statement, but the AC-3 bolts right in to the MS-4 speaker, just like
the AC-4.
That said, it IS a much better idea to put some sort of protective cover over it, since fingers
have a way of finding themselves in contact with HV.
The stuff known as 'cane metal' expanded aluminum from the hardware store that can be cut with
heavy scissors works great, and as it 'could' be inside the MS-4 appearance isn't mandatory.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com <http://www.k4oah.com>>
Larry Sack wrote:
> As I was poking around my newly rebuilt AC-3 power supply, I had a thought to create something
to keep fingers, wayward conductive tools, dropped objects, etc. from entering the unholy high
voltage regions of the AC-3. While the bottom is securely fastened and not subject to the above,
the above board area concerns me. The AC-4, if mounted in the MS-4 speaker, is nicely protected
however nothing exists for my lowly AC-3.
> I was thinking of heading to the nearest home improvement store to obtain a sheet metal
decorative screen or even plain sheet metal (heat's an issue). Two quick bends, a few holes for
screws and some black (Drake blue?) spray paint would make a nice U-shaped cover. I haven't
thought how to close up the ends although the transformer end doesn't bother me as much as the
high voltage/bright sparking end.
> Has anyone else tried this? Thoughts? How do you address the safety of the
beast?
> Larry, N8QNM
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