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 Post subject: Need Couplate cross reference
PostPosted: Oct Sun 10, 2021 1:31 pm 
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Does anyone have a couplate cross reference or know if one is online? I need a GE couplate part# REK-021 crossed to a Sprage and Centralab number.

Thanks.

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Sun 10, 2021 5:20 pm 
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Sometimes the schematic of the product that uses a particular couplate, gives an internal view of what makes up the couplate.

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Sun 10, 2021 5:46 pm 
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I would like the cross, please. I have a source for NOS couplates, but they dont have a way to cross the GE part number to Sprage or Centralab.

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Sun 10, 2021 6:44 pm 
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I know of no cross-refs. If you have the GE schematic you can match it with a Centralab part - see the Centralab catalog at Bunker of Doom.

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Sun 10, 2021 8:06 pm 
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I’ve never seen a cross guide either, but if you can find a catalog from one of the major producers, they may mention their competitors part numbers

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Sun 10, 2021 10:38 pm 
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Post the schematic of whatever you're trying to fix or tell us the model number of whatever you're trying to fix.

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Mon 11, 2021 1:18 am 
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The GE part number is posted in my original post. I have the schematic. No, I dont want to build one, if I can find a Centralab or Sprague cross to see if I can find a NOS part. GE 17P1332 tv.

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Mon 11, 2021 2:45 am 
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Must have been custom for GE. Six of the 8 PECs in that set have Sprague and/or Centralab equivalents listed in the Sams folder, but not that one. It's R and C values for first audio and audio output. It's an oddball - audio output stage is stacked with IF strip power supply. I'd just wire up the discrete parts.

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Mon 11, 2021 4:46 am 
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Im thinking its bad, becasue Im measuring 100v on the output tube grid, but then again, there is no signal input at the antenna terminals, and i do have sound in the speaker. Then again, im not sure.

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Mon 11, 2021 8:22 pm 
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The audio tube is biased positive to split the 255V supply - cathode is at 135 V which supplies the IF strip. 12C5 wants 120 VDC, IF strip 135V, the two are in series. I did say it was an oddball...

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Mon 11, 2021 9:55 pm 
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Well I guess I'll give out my source for cross reference.

One is with pictures of the Couplates
http://pacifictv.ca/schematics/centralabcouplates.pdf

--------------------------------------
This one is the cross-references

http://pacifictv.ca/schematics/centralabpecross.pdf

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Tue 12, 2021 1:54 am 
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This cross guide does not list your GE number either.


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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Tue 12, 2021 3:13 am 
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Tom Bavis wrote:
The audio tube is biased positive to split the 255V supply - cathode is at 135 V which supplies the IF strip. 12C5 wants 120 VDC, IF strip 135V, the two are in series. I did say it was an oddball...

That's called a "stacked B+" circuit. Admiral was fond of them. Definitely not oddball.

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Fri 15, 2021 3:51 am 
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So, the 100v on the grid is normal in this circuit? Sams calls out for -5 volts.

Thanks.

Tony

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Fri 15, 2021 4:06 pm 
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I think we're dealing with another Sams goof. Many times in this circuit they tell you to connect the minus lead of your meter to the cathode connection of the tube and you will get a small negative reading on the grid. On your diagram they left that notification off.


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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Fri 15, 2021 4:07 pm 
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note


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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Fri 15, 2021 4:08 pm 
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circuit without the note


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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Sat 16, 2021 4:09 am 
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I got my download from Sams website. The scans they have are not from their file originals. The ones they have are folded and have service mans notes on them. Its like they went to the swap meet and started buying them to scan for themselves. On my download, all i see it what looks like -5. On your picture I can see more of the note.

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 Post subject: Re: Need Couplate cross reference
PostPosted: Oct Sat 16, 2021 4:10 pm 
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The Sams Photofact, set 383, folder 3, that I have been referencing, did not have the notation about where to measure the grid voltage from. However, I found another 383, folder 3 that did. Sams used to send out correction notices for these types of errors, but nothing was listed for this folder.


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