Post war 120volts to 12/24 power supply.

[Bruce MacMillan]

Bob, can you post a photo. There was no 120v to 12/24v power supply for the 19 set per se.

Are you talking about the CPP-2 made for the C42 & other Larkspur stuff? Big green box, VERY heavy.

[Edwin Wand]

In the 1950's we used a 120v power supply/converter for the 19 sets in Canada. Cant remember the model no or manufacturer but as noted it was very heavy. Mounted on a wooden base it took one man on each side to carry it. Others with direct RC Sigs experience could probably help out with more detail. Ours were painted OD and were about 18 "x12"x12". In the field we used 2 six volt and later 1 12v batteries.
Our 19 sets were replaced by the 510 and 26 set about the mid 50's, with the exhausted 26 set batteries being used to power razors

[Bob Carriere]

Sorry for being unclear I am talking about the CCP - 2 power sypply with a knife switch to give 12 or 24 volts.....actually more like 14.6v and 28.7 v.

The other 110 v power supply for the 19 set that fits on the board will be examined later...

Will post pictures later today....... both date stamped 1952.

Will attempt to cannibalize a double pole single throw switch from an old NRC research panel of the late 50s.... the original switch has screwed on terminals while the salvaged switch had soldered terminal..... trying to keep it original as possible...... and screwed in terminals are so much easier to service later.

Mike...... can you post the 19 set site.... thanks.


Bob C

[Mike K]

Originally Posted by Bob Carriere

Mike...... can you post the 19 set site.... thanks.


Bob C

sure

http://www.qsl.net/ve3bdb/

[Bob Carriere]

EUREKA........Got the CPP 2 working.

So simple yet......

I hunted down a separate used double pole single throw switch from a surplus NRC panel. Tested fine..... ready to be used as a substitute.

Removed the original switch from the CPP 2 and tested again.....seemed to work on one pole....... so being fearless and being that this is pre solid state.... the switch is actually assembled with two screws sealed with some black dry brittle paint. Decided to take the switch apart to see what was defective or broken.... chipped the paint and carefully took it apart laying out the small pieces.... contacts were a bit black and oily...... washed everything in an electrical contact solvent.... bent the contact arm for a bit more pressure and re-assembled...... now works perfectly.

Output dial works and puts out 13.4 to 19 volts in the low range and 26 to
39 volts in the upper range.

Now I have two reliable power sources.

Both CPP have minor differences which I now understand to be new large plastic covered capacitors instead of the fade yellow cardboard ones and evidence of modern spade type connectors otherwise identical.

One has a front door on the left hand side to access the 12 to 24 volts knife switch ...the older one requires that you remove the full cover to make the voltage changes.

Thanks Mike for the link to Chris who lives across town from me...... I will always be amazed by information coming from across the globe for something in my own back yard. I have saved the site and will no doubt be doing a lot of reading.

With the help of Stuart Fedak we will be organizing a little radio shack meeting in my sunroom for the Ottawa boys and hope to convince Chris to attend.

Now I have "juice" to play with ....... let's see how far I can progress before blowing a fuse!!!!!

Thanks everyone.

Bob C

[Bruce MacMillan]

The CPP2 is a brute force power supply. That's what makes it good for the 19 set & others that use a dynamotor. There is no electronic regulation so the power supply doesn't shut down with the high inrush current.

The output voltage will drop with load.

I have never seen any docs or a manual for the unit. Wonder if any exist?

[Jon Skagfeld]

Originally Posted by Bruce MacMillan

The CPP2 is a brute force power supply. That's what makes it good for the 19 set & others that use a dynamotor. There is no electronic regulation so the power supply doesn't shut down with the high inrush current.

The output voltage will drop with load.

I have never seen any docs or a manual for the unit. Wonder if any exist?

I've been collecting 19 sets and parts for years and never have I seen an operator/user manual for the CPP-2.

BTW, the CPP-2 being a power supply, we always referred to it as a rectifier.

I wonder if the inference was that, as a rectifier, it acted as a step down transformer?

[Jon Skagfeld]

Originally Posted by Bob Carriere

EUREKA........Got the CPP 2 working.

So simple yet......

I hunted down a separate used double pole single throw switch from a surplus NRC panel. Tested fine..... ready to be used as a substitute.

Removed the original switch from the CPP 2 and tested again.....seemed to work on one pole....... so being fearless and being that this is pre solid state.... the switch is actually assembled with two screws sealed with some black dry brittle paint. Decided to take the switch apart to see what was defective or broken.... chipped the paint and carefully took it apart laying out the small pieces.... contacts were a bit black and oily...... washed everything in an electrical contact solvent.... bent the contact arm for a bit more pressure and re-assembled...... now works perfectly.

Output dial works and puts out 13.4 to 19 volts in the low range and 26 to
39 volts in the upper range.

Now I have two reliable power sources.

Both CPP have minor differences which I now understand to be new large plastic covered capacitors instead of the fade yellow cardboard ones and evidence of modern spade type connectors otherwise identical.

One has a front door on the left hand side to access the 12 to 24 volts knife switch ...the older one requires that you remove the full cover to make the voltage changes.

Thanks Mike for the link to Chris who lives across town from me...... I will always be amazed by information coming from across the globe for something in my own back yard. I have saved the site and will no doubt be doing a lot of reading.

With the help of Stuart Fedak we will be organizing a little radio shack meeting in my sunroom for the Ottawa boys and hope to convince Chris to attend.

Now I have "juice" to play with ....... let's see how far I can progress before blowing a fuse!!!!!

Thanks everyone.

Bob C

Yeah, "juice" to play with...now watch your hydro meter spin into oblivion!