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 Post subject: DIY Comet Pro coil forms
PostPosted: May Wed 01, 2019 2:40 pm 
Member

Joined: Jan Mon 28, 2013 9:35 pm
Posts: 1453
Location: Santa Rosa, CA
For those of you out there that have this receiver but like me
have no, or a limited supply of coils they are easy to make.

The base of a 5 pin pre-octal tube works fine as the base.
A 4" piece of 3/4" PVC with the end turned down a few thou
on a lathe will give you a slip fit into the base. If you want to get
carried away, turn a wood plug/handle on your lathe. May not be
original but works, looks good doesn't cost a lot.

Winding info is available on the 'net.

Steve :idea: :idea:

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 Post subject: Re: DIY Comet Pro coil forms
PostPosted: May Thu 02, 2019 10:53 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 3647
Location: Monterey California USA
Steve, what do you think of this receiver? I picked one up last year at Fry's that came with all the coils other than the optional 10 Meter range but it is in the queue for refurbishing behind a pile of other refugees.

It will certainly be an example of superhets before single-knob tuning.

This one is the "all options" version with AVC and crystal filter, and some prior owner has Black & Deckered the panel for an extra pot and binding posts. Why, is still a mystery...

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 Post subject: Re: DIY Comet Pro coil forms
PostPosted: May Fri 03, 2019 1:46 am 
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Joined: Jan Mon 28, 2013 9:35 pm
Posts: 1453
Location: Santa Rosa, CA
Hi Geoff,
I was at the Fry's swap last month. You scooped me old buddy!
Glad you got it. A very historic receiver I've wanted for quite
a while.

I've had mine for a grand total of 4 days and it hasn't hit the bench yet
so can't comment on performance. No RF stage so expectations not
that high.
Steve

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 Post subject: Re: DIY Comet Pro coil forms
PostPosted: May Fri 03, 2019 5:27 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3647
Location: Monterey California USA
Hold on, this was last year, not last month, so you didn't miss anything! Last month didn't produce anything exciting, for some reason, and there were quite a few empty seller spaces.

The set came with some original documentation, but I think it is all on the web. There is a Rider's segment covering this receiver but there were so many variations that getting the correct schematic can be a bit tedious.

As with the RME 69, these have un-lettered front panels, which is a bit annoying at first.

It looks pretty simple to refurbish, unlike the successor Super Pro.

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 Post subject: Re: DIY Comet Pro coil forms
PostPosted: May Thu 09, 2019 8:50 am 
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Joined: Dec Sat 21, 2013 5:15 am
Posts: 408
Location: Puyallup, WA 98371
I just picked up an original coil form cheap on eBay to have something to duplicate.
I've obtained all the wire as specified by Hammarlund, and hope to soon start
making a set for my Comet Pro. Thinking about getting "carried away" and turning
knobs, too. One question, though. You're using 3/4" PVC? I'm planning to turn down
PVC too, to the original 1-7/16" outside diameter. Is 3/4" I.D. the right size to use? I
didn't think the walls were that thick, but I haven't gone shopping for it yet to see.

Thanks,

Dale

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 Post subject: Re: DIY Comet Pro coil forms
PostPosted: May Thu 09, 2019 2:10 pm 
Member

Joined: Jan Mon 28, 2013 9:35 pm
Posts: 1453
Location: Santa Rosa, CA
I used the thick wall type of 3/4" PVC. Was not trying to match the
diameter of the original forms since I'll be winding my own.
The only limiting factor was getting the PVC to fit into the salvaged
tube bases.

Planning to make up a nice set of coils that will make the receiver
more usable.

Don't have any original coil forms yet but a friend has offered a couple.
Steve

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