Around 1983 to 1985, David Hafler made a bridging kit DH-222 for his
DH-220 amplifier.  Where can I get one now or at least specific
information on the DPDT switch used in the kit?  You can access the
instruction manual for the DH-222 at the Hafler web site that list the
parts in the kit but it's not specific enough, for me anyway,
regarding the switch.  The technicians can't help because although
they kept the name it's not the same company and they don't service
the "older" equipment.

Thanks

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Clarification of Question by dbruce-ga on 11 Mar 2005 08:34 PST

Thanks, a couple of days is fine.

Bruce

Any reason why it should have to be a particular DPDT switch for the bridging?

Best

Downloaded the pdf and it looks like a bog-standard switch. OK, pretty
high current but nothing special as far as I can see. What part of the
universe do you inhabit -- I can check out dealer parts if you'd like.

Best

The wiring requires a 6 post switch and I'm not sure if all 6 post
switches are the same.  I'm also not sure of the voltage, resistance,
etc.  I can put it put it together but I,m no electronics wiz.  I live
in Annapolis, MD.
Thanks

Fine. Give me a day or two and I?ll get back to you -- bit time short
tonight. Shouldn?t be a problem finding something suitable. I?ll match
up the wiring diagram to the switch functions. Perhaps a researcher
will get there first though.

Best

Yes that switch function is absolutely standard. The drawing on the
pdf is a little misleading because the ?three terminal sides? should
be shown as the longer ones. Almost always, the two centre terminals
are the poles of the switch, ie ?2? and ?5? on the diagram. Again
almost always, the contacts which mate to the poles are opposite to
the direction of the toggle.

In the up position.....
?2? makes contact with ?3?
?5? makes contact with ?6?

In the down position......
?2? makes contact with ?1?
?5? makes contact with ?4?

When I glanced at the pdf before I though the output was being
switched, which is why I said high power. Duh. Actually it is very low
power, so best switch type would be low current, gold contacts. Not
expensive and readily available. You?d get away with a higher current
spec part but low current ones are more suited to this application
(for electrical reasons which I shan?t bore you with). You might be
able to find something suitable at your local electronic store, if
there is one. Otherwise Digikey :-

http://www.digikey.com/

Suitable items are (or should be) ......

CKN1032-ND
EG2399-ND
EG2409-ND
360-1144-ND
360-1126-ND
360-1113-ND

These include variations in toggle style, body size and bushing. All
only a few dollars. Check them out. Doesn?t have to be a toggle switch
though, you could use a rocker if more in keeping with the design.
There are also locking toggles which you have to pull to change
position so they can?t be accidentally knocked into the wrong
position. The catalogue is available for download but it?s nice to
have the printed item (800+ pages).

Sorry for slight delay. Post for clarification or further advice if needed.

Best