[Collins] 516F-2 Replacement Transformer and Chokes

Sat, 17 Jan 2004 00:19:43 -0500

Thank you for the correction.  

Bill, K3PGB

Adam Farson wrote:
> 
> Hi Bill,
> 
> With all due respect...
> 
> The nominal mains frequency in Canada is 60 Hz, as in the US. Nominal
> distribution voltages are 120/240V single-phase, or 120/208V 3-phase. Your
> transformers will work just fine up here.
> 
> Europe and many other parts of the world have 220 or 240V, 50 Hz mains.
> Japan enjoys the singular distinction of using both (50 Hz in the east, and
> 60 Hz in the west.)
> 
> Best 73,
> Adam, VA7OJ/AB4OJ
> North Vancouver, BC, Canada
> http://www.qsl.net/ab4oj/
> 
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Bill Abate
> Sent: Friday, January 16, 2004 13:00
> To: Collins CRA
> Subject: [Collins] 516F-2 Replacement Transformer and Chokes
> 
> Good news!
> 
> I have received enough interest to warrant another production run of
> transformers and chokes for the 516F-2 power supply.  These will be
> identical to the ones I had produced about 2 years ago with great
> success.  For those not familiar, the replacement transformer specs for
> the 5126F-2 would be as follows: The transformer laminations will be 3"
> thick X 5 1/4" wide X 4 3/8" high, as original.  The mounting holes will
> be 4 1/2" X 4 1/8" c-c as original.  The transformer will have end
> bells, as original.
> 
> The electrical specifications will be a little different.  The primary
> will be tapped for 115, 120 and 125 VAC (not 115/230).  That should
> cover every part of the country!  (No more variacs or buck/boost
> transformers).  The filament winding will be 6.3 VAC @ 11 amps. The HV
> secondaries will be 1920 VCT @ .275 amp and 720 VCT @ .25 amp.  The
> current specs are for the KWM-2A plus a little extra.  The high voltage
> secondaries were based on my 516F-2 RE unloaded transformer
> measurements.  I then deducted 60 volts from the measured voltage to
> center tap because I'm eliminating the 5R4, and 50 volts for eliminating
> the 5U4.  My tube manual claims those are the voltage drops for those
> rectifiers.  Since we will be using diodes, I eliminated both 5 volt
> secondaries.  I think this is the way Collins would have designed it
> today.  The transformer will be for 60 HZ NOT 50 - 400HZ as original.
> If our Canadian friends or others want 50 HZ and will pay the adder for
> that plus extra shipping and duties involved, let me know and I'll see
> how much more it will cost, if it is possible.  No tire kickers please,
> this project is taking enough time as it is.
> 
> The Chokes will have the original inductance of 8H and 1H, each at 350
> ma. which is a little beefier.  Coincidentally I recently had to replace
> one of the 8H chokes in my 516F-2.  It fit like a glove.  The no load
> voltage came down from 1400 volts to about 900 volts, as it should.  My
> KMW-2A is very happy again!  The 8H chokes come with end bells but only
> the upper choke uses both.  I simply removed one end bell.  You have to
> reuse the original mounting hardware as it is special.
> 
> I had previously quoted a price of $120 plus S&H.  Well due to the nice
> response I got the transformer down to $115, DELIVERED!  The 8 H choke
> would be $29, delivered and the 1 H choke would be $17.50, delivered.
> This is based on the tentative response I have received so far.
> Hopefully we will hold those quantities.
> 
> If you emailed me previously, I have responded to you directly.  If you
> have not received an email direct, I did not hear from you.  In either
> case, if you are interested, email me now with the firm number of each
> that you want.  Do NOT send money at this time!  This time is for real.
> If you are not sure you will want them  for whatever reason, don't
> respond.  Those who did not respond before or are hearing about this for
> the first time, jump on board.
> 
> I just want to mention the disclaimer that you are buying the chokes
> from the manufacturer, not me.  I am not making anything out of this and
> don't want to.  I just want a good transformer/choke at a good price
> like everybody else.  If there is a problem with your shipment, contact
> the manufacturer.  That is between the two of you.  I'll help, if I can,
> but that is it.
> 
> Bill, K3PGB