[Amps] isolation xfmr TSPA

[TexasRF@aol.com]

When I saw Barrie's email about this I wondered if an isolation transformer  
is needed. Is it needed?
 
73,
Gerald K5GW
 
 
In a message dated 2/28/2006 11:57:42 A.M. Central Standard Time,  
jtml at lanl.gov writes:

Reasonable price? 750 VA is not a small transformer, so expect to pay  
more than scrap metal prices!

Allied Electronics has a toroidal  transformer for 750 VA, 117 Pri/117 
Sec (or 234 if series connected). Its  made by Hammond, their p/n 
182Q117, Allied # 836-0962, for $103. If you  want a straight 
isolation transformer, with electrostatic shield, hi pot  tested from 
pri/sec, then they have the 836-6340 for $143. Allied lists  
Thordarson, Triad, Stancor, and others, and they are all in this  
ballpark.
Mouser and Digikey also carry some of these same  units.

Another transformer which is often available is the Signal  brand, 
they make some beautiful 1:1 transformers in 250, 500, 750 and 1  kVA 
ratings. I prefer that one, have used them before.

You could  check your local electrical supply for electricians, we 
have about a dozen  of them to choose from in Albuquerque. They may 
have a control or machine  tool transformer that will do it, but most 
of them are 240/480 primary to  120 secondary, for operating controls 
etc in a big machine off the primary  circuit.

Most surplus dealers, like Murphys in LA, OEM Parts in  Colorado 
Springs, Surplus City in Albuquerque, and similar in the rest of  the 
county, have a stock of old Stancor beasts that will do this,  
sometimes they have a linecord on them and a single outlet with a tap  
switch on the back. Those can be had for probably half the above 
cost.  You have to know what you are looking for to get those, have a 
catalog  handy with old part numbers.


>Will be putting a SS 1296  amplifier, complete with 40 amp switching 
>power supply, on a tower  soon.  Will need to run 120 volts AC up the  
>tower.
>
>Looking about, I don't see any 120/120 volt, 600  to 700 watt 
>isolation transformers for sale at what I consider a  reasonable 
>price.
>
>Any ideas as to a  source?
>
>TIA, Barrie,  W7ALW
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