Grunow - Model 654 | I.F. Transformer Lead Dress Repairs & Replacing More Capacitors & Resistors

New lead dress on both I.F. Transformers and tackling a few capacitors and resistors along the way.
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In the second episode, replacing a few capacitors and resistors before discovering the I.F. Transformers lead dress issue that needs to corrected.
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In the first episode, preparing to restore this beautiful Grunow (General Household Utilities Co.), Model 654, Chassis 6N from 1937. The cabinet is very unique being a Table Upright; looks like a mini console covering two bands, i.e., the BC (550-1750) kHz and SW (2000-7000) kHz. The I.F. Frequency is 465 kHz.
The schematic: Riders 8-19, 20.
The receiver tube complement:
6K7G - RF Amplifier
6A8G - 1st Detector/Oscillator
6K7G - I.F. Amplifier
6Q7G - 2nd Detector/A.V.C. & Audio Amplifier
6F6G - Power Output
80 - Full-Wave Rectifier
The playlist for the series:
studio.kzbin.infoP...
LC (Front-End) AM Broadcast Tester - One Chip AM Radio Circuit
studio.kzbin.infoZG_E...
Thanks for watching and subscribing to my channel on vintage radio repair and other related circuits.
#restoreoldradios

[@AllAmericanFiveRadio]

Great work Don, The I.F. should be good for many more years!

[@RestoreOldRadios]

Thank you Rick, definitely safer once power gets applied down the road. Best, Don

[@lawrencehalpin6611]

Thank you very much for posting this video. I always learn something from you. God bless.

[@RestoreOldRadios]

You are very welcome. Thanks for your kind words and watching. Best, Don

[@Radio478]

Thanks for updates on the radio, it's really helpful 👍

[@RestoreOldRadios]

I appreciate you watching the series and reaching out. All the best. Don

[@chetpomeroy1399]

Looking good, Don! Replacing the faded old leads with new ones having the correct, original colors is a nice touch! These older, larger IF transformers with trim caps on top, I think, were a better design than the newer, smaller ones with the adjustable ferrite inductors and those internal sheet capacitors that invariably develop silver-mica disease. It is my thinking that this later evolution (or devolution) was a cost-cutting measure in the later postwar AA5 receivers.

[@RestoreOldRadios]

Chet - definitely should be safer to operate once I get to that point in the restoration with the new lead wires in place. I agree, the later I.F. Transformers were (are) inferior as compared to the ones from this era. Thanks again for reaching out and following the series. Best, Don

[@hestheMaster]

No wires were removed from their stock position only replaced . They are where they are because of something called lead dressing. Good stuff Don as I don't see many vids on this and lots of guys end up with a vintage radio with crumbling wires going into IF transformers. Do them one at a time and use written notes and photos of where they went exactly before tackling wire replacement. If you don't do this right you can get into problems with hum, whistling, squealing or low volume as you tune the dial. Found that in the book Elements of Radio Servicing , it's one of my favorites.

[@RestoreOldRadios]

Thank you Steve. Great response for those following along and for future reference as well. As always, I appreciate your supportive comments. Best, Don

[@greggsvintageworkshop8974]

Great job Don!

[@RestoreOldRadios]

Appreciate it Gregg. Best, Don

[@davido.hamilton3254]

Thanx for the video Don. Would you please tell us where you purchased that 'capacitor checker' for determining the 'outside foil' connection? Bless Your Bunions!

[@RestoreOldRadios]

Thank you for watching. The build is my design and below you’ll find the schematic, BOM, etc., that I freely shared. Be sure to review the video description for links to the files. Hope this is helpful. Best, Don Capacitor Outside Foil Sniffer w/ Arduino Version 2.0r | Improved Accuracy kzbin.info/www/bejne/iam8imafiLKGaassi=2C86kEWYVLz0p6Vf

[@paradiselost1914]

Do you work on WWII era military radios too?

[@RestoreOldRadios]

I have not, just some unrestored vintage radios in my collection. What type of military radios do you enjoy? Best, Don