Re: [ARSCLIST] lateral cut switch

[Robert Hodge <rjhodge@xxxxxxx>]

In the spirit of options , I offer these thoughts.

Some years ago I wired a 16 inch Pickering tonearm with a phase
inversion switch. The DPDT switch is mounted in the channel  in the
tonearm portion of the assembly and consequently avoids adding mass to
the cartridge mount.  The switch is a subminiature  " MICRO"  type that
easily fits into the channel. The hole for the toggle was located above
a cutout in the arm making installation very easy.
The bearings in the pivot were removed and cleaned/ lubricated with a
very thin grease . The needle bearings for the pickup were cleaned and
left dry. 

Completly trouble free service for the last twenty or more years.

Why not ( If you have a second cartridge to spare )  wire a second head
shell with the phase invertion already installed ?  I'm guessing that
your tonearm has a socket and that the shell isn't hardwired into the
arm assembly.

Please excuse me if I sound insulting as it isn't meant to be in any
way shape or form.  

Best !

Bob Hodge 

Robert Hodge,
Senior Engineer
Belfer Audio Archive
Syracuse University
222 Waverly Ave .
Syracuse N.Y. 13244-2010

315-443- 7971
FAX-315-443-4866

>>> insuranceman@xxxxxxxxxx 5/27/2006 7:54 PM >>>
Thanks Marcos.
----- Original Message ----- 
From: "Marcos Sueiro" <mls2137@xxxxxxxxxxxx>
To: <ARSCLIST@xxxxxxxxxxxx>
Sent: Saturday, May 27, 2006 7:57 AM
Subject: Re: [ARSCLIST] lateral cut switch


> Here is a good explanation of the principle (3rd paragraph) and how
to do 
> it.
>
> <http://perso.wanadoo.fr/jlf/erepro2.htm>
>
> --On Friday, May 26, 2006 1:40 PM +0200 George Brock-Nannestad 
> <pattac@xxxxxxxx> wrote:
>
>> From: Patent Tactics, George Brock-Nannestad
>>
>> Hi Phillip and Graeme,
>>
>>
>> you posted:
>>>
>>> On 26/05/2006 you wrote;
>>>
>>> ph> Cool cartridge/headshell modification.  I never would've
>>> ph> thought of this.  Now how does it work (so I can do it)?
>>>
>>> I wouldn't recommend you do this, it raises the mass of the
headshell
>>> by some considerable degree (the switch probably weighs more than
the
>>> headshell) and this is not a good idea at all.  Far better to
place
>>> the switch further down the line.
>>>
>>
>>
>> ----- actually it is a good idea. It enables the reversal of
polarity of
>> the  floating (non-grounded) coil in a stereo pickup, thereby
enabling
>> summing to  vertical instead of horizontal. I have used it for 30+
years,
>> only, precisely  because of the mass you mention, Graeme, mine is a
>> switch I obtained from a  company that manufactures hearing aids,
with no
>> metal, except for switch  blades and contact points (gold, rather
than
>> silver).  The rest is plastic.  Soldering needed precision work. I
did
>> not have a preamplifier that permitted  doing reversal at the time.
>>
>> Kind regards,
>>
>>
>> George
>
>
>
> Marcos
> http://tinyurl.com/kqdbk 
>
>