38-690 volume control - Printable Version

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+--- Thread: 38-690 volume control (/showthread.php?tid=13625)

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38-690 volume control - FStephenMasek - 12-07-2015

Do you know the cross-over parts numbers for the Philco 38-690 volume control, Philco part number 33-5240?  They one on my 38-690 has some bad spots, and it has been cleaned, so it would be nice to find a replacement.   

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RE: 38-690 volume control - Chuck Schwark - 12-07-2015

Hi,

I'll search all the 37/38 Philco dealer parts catalogs for that part 
when I get home from work this evening.  Prob. in there.

Chuck

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Resistance values for 38-690 vol pot - Chuck Schwark - 12-07-2015

Looking for the values of the dual-pot volume control on the Model 38-690.

All Philco service bulletins and 1937-40 Philco parts catalogs do not show the resistances 
of the two sections.  Only the Philco part number:  33-5240.

Seems Philco never published parts values in their 38-690 service bulletin. 

Any help appreciated,

Chuck

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RE: Resistance values for 38-690 vol pot - etech - 12-08-2015

(12-07-2015, 10:13 PM)Chuck Schwark Wrote:  Looking for the values of the dual-pot volume control on the Model 38-690.

All Philco service bulletins and 1937-40 Philco parts catalogs do not show the resistances 
of the two sections.  Only the Philco part number:  33-5240.

Seems Philco never published parts values in their 38-690 service bulletin. 

Any help appreciated,

Chuck

Hi Chuck,

While the parts list does not show the values, they are printed on the schematic as part #75 at 500K and part #76 at 100K.

BTW, keep up the good work. I have your data package for my 38-690 code 125 and it has been invaluable.

Thanks again!

Ed

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RE: Resistance values for 38-690 vol pot - Chuck Schwark - 12-09-2015

Ah, ok.  My Philco original schematics do NOT show any parts values.  ??

Could be a very early edition maybe.  Will have to research.....

Thanks,

Chuck

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RE: 38-690 volume control - Chuck Schwark - 12-09-2015

Hi again,


While the parts list and schematic I have does not show the values, they were provided by 
another member here on the Phorum.


Part #75 is 500K and part #76 is 100K, for the dual pot.


Chuck

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RE: Resistance values for 38-690 vol pot - etech - 12-09-2015

(12-09-2015, 09:20 AM)Chuck Schwark Wrote:  Ah, ok.  My Philco original schematics do NOT show any parts values.  ??

Could be a very early edition maybe.  Will have to research.....

Thanks,

Chuck

Hi Chuck,

I took the information from the schematic you sent me as part of my packet. It is marked "38-690 Code 125 Figure 1". On the back side of this page is the alignment page and the chassis pictorial page.

Best regards,

Ed

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RE: Resistance values for 38-690 vol pot - Chuck Schwark - 12-09-2015

Hmmmm....time to retire.  (sigh)
  

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RE: Resistance values for 38-690 vol pot - sam - 12-09-2015

retire   
na  you just need a few martini`s to start the day.  you`ll be fine  
[Image: https://upload.wikimedia.org/wikipedia/commons/3/30/Bright-Field_Lighting.jpg]

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RE: Resistance values for 38-690 vol pot - Chuck Schwark - 12-09-2015

Not with those 1/2 filled glasses I wouldn't!

AND, they're not chilled!!!

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RE: 38-690 volume control - SteveJB - 12-18-2017

Hi Guys,

Did you ever get a good cross over part no. for the volume control?  My 690 seems to be bad at the low vol section.   I'd like to replace it if I can find a suitable part.

Steve

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RE: 38-690 volume control - morzh - 12-18-2017

Steve

have you tried to ask Mark Oppat?

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