Mellotronists

FYI on Chamberlins (a bit of de-lurking...) and magnetic fields: On the
M series, the cheap preamp transformer doo-hickie is provided as an
outboard appliance with a warning to keep it away from the machine -
perhaps Harry and Richard were concerned that the tight real estate
space in the 'tabletop' design could create a problem for the tapes...or
they were just paranoid. 
Either way, I used to plop my Crumar T1 organ on the top, which has a
sizable transformer in it...no problems. In my M2, I by-pass the old
pre-amp and take my headblocks direct to a Cerwin-Vega rack-style
pre-amp - just need to remember not to run the tapes while I'm turning
the pre-amp on in case of a 'pop' ending up feeding back onto a tape....

Vance

-----Original Message-----
From: ferrograph@... [mailto:ferrograph@...] 
Sent: Wednesday, October 15, 2003 5:24 PM
To: Mellotronists@yahoogroups.com
Subject: Re: RE: [Mellotronists] MK2 Spkr.Magnet Question

well I think.... er.... what where we talking about? mind's gone
blank.....

I was pretty sure it was a cube law too. the best way to find out how 
dangerous magnetism is (when it's going to be close to tape, anyway) is
to experiment 
with something that doesn't matter. magnetism doesn't travel very well 
through air.
 
many tape-recorders from portable cassette machines to full-blown
grown-up 
pro machines like nagras have speakers right under the tape-path, and
quite a 
few of the cheaper cassette portables used permanent magnets as erase
heads, 
moving them into position when required from as close as a few mm away.
erasing 
tape is quite difficult, even with older formulations, while the new
'tron 
tapes are quite a bit hotter to start with.
I expect les must've tried it to be on the safe side, though.

as for perching other things on the 400's lid, you're more likely to 
encounter HF interference if anything; the pre-amp is pretty-well
shielded against 
anything else. 1098 complained about a cheap midi controller once, but
then who 
wouldn't?

duncan/1098, currently propping up a sick schaltwerk, and waiting for a 
second sh1000 to show up.


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