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Hammarlund SP-600
R-274A/FRR

 

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Hammarlund SP-600-JX-1
(serial # 3880)

A rare find in this condition with a desk-top cabinet, from the estate of a retired engineer. One of the finest communications receivers of it's era in beautiful condition. I just completed servicing this fine piece and would love to keep it but it would mean getting rid of one of my vintage televisions which I love more. The service performed included: replacing a number of capacitors, resistors, new 3 wire, grounded plug AC cord, cleaning controls & switches and a careful IF/RF alignment.

Other work includes, installing a separate low impedance output transformer with impedance matched speaker which can be seen in the image rear views. The original 600 ohm output transformer was left in place and can easily be switched back to it's original configuration by changing 2 connections. Added transformer is mounted external from the chassis, can be seen just right of the speaker inside the desk-top cabinet (rear view). It too can easily be removed without altering the originality of this receiver.

When I acquired this piece, the panel above the receiver was blank, so I had an opening cut out  professionally by a local machine shop.  I then mounted a low impedance speaker that I had on hand in that space. The speaker looks as if it were made for that space. Rather than mount the transformer somewhere on the chassis, I opted not to modify the radio in any way and placed it where it could easily be removed if someone wanted to re-configure it back to the 600 ohm impedance.

The cabinet finish is near perfect except for a couple of very small blems in the form of paint chips. The worst blemish (scratches) is on the top right rear and can be seen by clicking here.

The RF/AF meter works fine but the AF portion is connected to the 600 ohm output transformer's secondary. So by using the added 4 ohm transformer, as it is now configured, the AF portion of the meter is not functional (which is no big deal).

For those not familiar with this receiver, here are some of it's features:

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