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 Post subject: Zenith Royal 74Y chassis 8MT41Z9
PostPosted: May Sat 23, 2020 5:05 am 
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Joined: Oct Mon 02, 2017 8:53 am
Posts: 502
Location: Panama City, FL 32401
If anyone has any information on this chassis I'd sure appreciate it. The earlier version I have that ends in Z2 has the same electrolytics except the a.g.c. is 15uf, and has two 100uf caps. This chassis has an 8uf for a.g.c. and one-100uf,which looks original but I'm not sure. The original 50uf looks to have been replaced by a modern 47uf. The remaining 5uf cap is original. It seems odd with only one 100uf cap,since it's not a multi segment like the earlier version. The radio is working as is,but does need a recap and it's deaf on the higher half of the band. This chassis ends in Z9. Thanks!


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 Post subject: Re: Zenith Royal 74Y chassis 8MT41Z9
PostPosted: May Sat 23, 2020 4:41 pm 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 6467
Location: Indianapolis, IN
Check your PM's...

John


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 Post subject: Re: Zenith Royal 74Y chassis 8MT41Z9
PostPosted: May Sat 23, 2020 5:03 pm 
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Joined: Oct Mon 02, 2017 8:53 am
Posts: 502
Location: Panama City, FL 32401
Sent. Thanks very much John!


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 Post subject: Re: Zenith Royal 74Y chassis 8MT41Z9
PostPosted: May Mon 25, 2020 4:16 am 
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Joined: Oct Mon 02, 2017 8:53 am
Posts: 502
Location: Panama City, FL 32401
I recapped this today. Had to remove the bracket that holds the antenna on,and partially remove the circuit board. Also took off the original battery holder and added a 9v clip. I aligned it and it seems to receive real well throughout the band. Someone had changed the Emitter bypass cap only. Seems odd,because if you're going to take the radio apart...Great performer and well built too. I'll be listening to this late tonight I'm sure.


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 Post subject: Re: Zenith Royal 74Y chassis 8MT41Z9
PostPosted: May Mon 25, 2020 3:58 pm 
Member

Joined: Oct Mon 26, 2009 10:02 pm
Posts: 6467
Location: Indianapolis, IN
Glad you got it done and it works well !

Excellent radios when working properly but not fun to work on...

John


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 Post subject: Re: Zenith Royal 74Y chassis 8MT41Z9
PostPosted: May Mon 25, 2020 7:34 pm 
Member

Joined: Oct Mon 02, 2017 8:53 am
Posts: 502
Location: Panama City, FL 32401
Listened to it last night. The Royal 755M/74 have a "big radio" sound to them,even more pronounced than the Royal 750. I believe the larger case it's in makes a difference. The volume pot has a heavy duty feel to it,similar to the Royal 200. I don't think you'd ever need the low setting on the tone switch. Maybe if the band was noisy, or if someone had an annoying voice, but usually never. John was correct in saying it's difficult to work on. I'm glad I replaced that 5uf cap,as it appeared to be shorted, showing a negative reading. The other caps had drifted way off their values. I'd like to know how long this model was produced. I believe the 755M started in late '64 or early '65. This model replaced the 755M in '66 I believe. So it's probably correct to assume it went into '67 at least. If anyone knows please let me know. Thank you!


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