Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives :: Books
Support This Site: Contributors :: Advertise


It is currently Feb Sun 25, 2018 2:33 pm


All times are UTC [ DST ]





Post New Topic Post Reply  [ 7 posts ] 
Author Message
 Post subject: Motorola HS-442 mono tube amp schematic needed
PostPosted: Feb Sun 04, 2018 1:50 pm 
New Member

Joined: Feb Sun 04, 2018 1:41 pm
Posts: 4
Gentlemen:
I found a very nice Motorola HS-442 mono tube amp at a Hamfest yesterday. Very clean. Likely needs recapping but I am trying to find a schematic. Also if anyone knows the output power of this amp. It has a pair of 6V5 tubes in push-pull in the output. I only paid 10 bucks for it but it looks extremely clean, no rust on the chassis. Any help would be greatly appreciated. ---Marty, KK4RF, Suffolk, VA


Top
 Profile  
 
 Post subject: Re: Motorola HS-442 mono tube amp schematic needed
PostPosted: Feb Sun 04, 2018 6:34 pm 
New Member

Joined: Feb Sun 04, 2018 1:41 pm
Posts: 4
OOPS! I meant to type in "a pair of 6V6" tubes instead of the incorrect 6V5. Sorry for any confusion---Marty Harpen, KK4RF


Top
 Profile  
 
 Post subject: Re: Motorola HS-442 mono tube amp schematic needed
PostPosted: Feb Sun 04, 2018 7:50 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 17091
Location: Albuquerque, NM 87123
It's covered in Sams 282-10.


Top
 Profile  
 
 Post subject: Re: Motorola HS-442 mono tube amp schematic needed
PostPosted: Feb Sun 04, 2018 8:42 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 4043
Location: Boston, MA USA
Power output of PP 6V6s can be between 5 and 15 watts depending on B+, which can be anywhere between 250 and 350V.

-David


Top
 Profile  
 
 Post subject: Re: Motorola HS-442 mono tube amp schematic needed
PostPosted: Feb Sun 04, 2018 9:25 pm 
New Member

Joined: Feb Sun 04, 2018 1:41 pm
Posts: 4
Many thanks to David and Johnnysan. I will put in a request with Sams. Just curious if you guys knew what the output impedance of the amp is, i.e. 3.2 ohms, or 4 ohms, 8 ohms or whatever. Thanks again, Gentlemen.---Marty, KK4RF


Top
 Profile  
 
 Post subject: Re: Motorola HS-442 mono tube amp schematic needed
PostPosted: Feb Sun 04, 2018 11:22 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 17091
Location: Albuquerque, NM 87123
I have that Sams; if you PM your email address I will scan it for you. It's 4 pages.

1 speaker is 6.8 ohms and the other is 15 ohms, so my guess would be that the impedance is around 4 ohms.


Top
 Profile  
 
 Post subject: Re: Motorola HS-442 mono tube amp schematic needed
PostPosted: Feb Mon 05, 2018 11:39 pm 
New Member

Joined: Feb Sun 04, 2018 1:41 pm
Posts: 4
Gentlemen:
Thanks for all the info. I was able to download the 4 page description on Sams, 282-10. Thanks for all the offers of help as well. I hope to recap this nice old amp in the next month or so. Need to figure out what I'll use it for but I'll find something. Thanks again, Marty, KK4RF


Top
 Profile  
 
Post New Topic Post Reply  [ 7 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 3 guests



Search for:
Jump to:  






















Privacy Policy :: Powered by phpBB