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


It is currently Dec Mon 11, 2017 5:07 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 8 posts ] 
Author Message
 Post subject: A Good Multiplex Unit? Manufacturer & Model?
PostPosted: Nov Tue 14, 2017 2:46 am 
Member
User avatar

Joined: Sep Tue 15, 2009 9:38 pm
Posts: 1730
Location: Mecosta MI
Hey Cats,

I've been acquiring a few "one lunger" tuners the last couple of years & wanted to test them against each other in "stereophonic" mode. :roll: :lol: I want to give them all a quality test through the normal *mono* mode also.

I'm going to use my Harmon-Kardon TA-12 receiver for the mono tests, & through a multiplexer into one of my Monarchs, integrated stereo amps, for comparing each one.

Best to worst tuners I want to compare that I have are a Mc MR55, a couple of Harmon-Kardons, a Monarch & an Olsen.... IF all of that matters?

Just purchased a Olsen AM-158 Integrated amp also to toy with. :)

What's a Good Multiplexer to get, for what I'm trying to attempt? :shock:

Thanks for reading,
Lloyd
_____________________________________________________________________

Feeling foolish, just last minutes when asking. Never asking, being foolish last forever.


Last edited by CrumblingWires on Nov Wed 15, 2017 7:43 pm, edited 4 times in total.

Top
 Profile  
 
 Post subject: Re: A Good Mutiplex Unit? Manufacturer & Model?
PostPosted: Nov Tue 14, 2017 2:57 am 
Member

Joined: Jun Thu 15, 2006 1:21 am
Posts: 4683
Location: NE Ohio
Can't remember the model number but I can say that the units from Pilot worked well for me.

Thanks to Dave - Model 100

_________________
Bruce


Last edited by Bruce Hagen on Nov Tue 14, 2017 5:27 pm, edited 1 time in total.

Top
 Profile  
 
 Post subject: Re: A Good Multiplex Unit? Manufacturer & Model?
PostPosted: Nov Tue 14, 2017 11:51 am 
Member

Joined: Apr Mon 24, 2006 1:05 am
Posts: 2276
Location: Ellington CT
My MR-55 is working very well with a Scott 335 mpx adapter. Nice clean audio with great separation. :)

_________________
"There Is Nothing Finer Than A Stromberg-Carlson"


Top
 Profile  
 
 Post subject: Re: A Good Multiplex Unit? Manufacturer & Model?
PostPosted: Nov Tue 14, 2017 12:21 pm 
Moderator

Joined: Jan Thu 01, 1970 1:00 am
Posts: 19396
Location: Utica, NY 13502 (USA)
I stumbled upon a Pilot 100 a few years ago which works well after restoration.

Image

https://www.radiomuseum.org/r/pilot_fm_ ... r_100.html

Dave


Top
 Profile  
 
 Post subject: Re: A Good Multiplex Unit? Manufacturer & Model?
PostPosted: Nov Tue 14, 2017 5:21 pm 
Member

Joined: Nov Sun 04, 2007 6:01 am
Posts: 2689
Location: Redding, CA
The Ampex multiplexer is highly regarded. When adding a multiplexer to an FM receiver not specifically designed for a multiplexer, the IF amplifier will likely need to be adjusted for a wider bandpass at the expense of sensitivity.

Norman

_________________
"No home is complete without music" - Capehart Sound Amplifying and Distributing Systems


Top
 Profile  
 
 Post subject: Re: A Good Multiplex Unit? Manufacturer & Model?
PostPosted: Nov Wed 15, 2017 2:09 am 
Member
User avatar

Joined: Sep Tue 15, 2009 9:38 pm
Posts: 1730
Location: Mecosta MI
Thanks to all 4 who responded.

Sorry for not getting back sooner, busy at work.

Bruce,

Thank You for getting back to me so quickly, this was ending on the 'bay & I had been watching it for a couple of days. Looked in Good shape, seller said it had the "cable." :) So "I dropped the hammer" found out someone liked it almost as much as I did. :lol: 17 bids, $109+$10.50 s&h.

Attachment:
Pilot Multiplex 120.jpg
Pilot Multiplex 120.jpg [ 63.43 KiB | Viewed 334 times ]


Bruce or Dave,

Is there anything to be aware of when "crackin' the cage" on these Pilots?

stromberg6 & Norman,

I'll keep an eye out for the Scott & Ampex units. Anything to help that *unwanted* MR55 sing. I like it. A piece of McIntosh's early history. :)

Norman,
A Special Thank You for giving my little buddy Jon some guidance & a helping hand. :wink:

Lloyd
_____________________________________________________________________

You make a Living with things you Get,
You make a *Life* with things you Give.


Top
 Profile  
 
 Post subject: Re: A Good Multiplex Unit? Manufacturer & Model?
PostPosted: Nov Wed 15, 2017 1:31 pm 
Moderator

Joined: Jan Thu 01, 1970 1:00 am
Posts: 19396
Location: Utica, NY 13502 (USA)
CrumblingWires wrote:
Is there anything to be aware of when "crackin' the cage" on these Pilots?
Recapping and alignment was quick and easy. Be aware that some early component tuners have a jack labeled "Detector Output" which may not be the same as MPX output. I discovered that the detector output on my Pilotuner was connected after the de-emphasis circuit which eliminates the needed MPX information. Converting this jack to "MPX Output" was an easy modification.

Dave


Top
 Profile  
 
 Post subject: Re: A Good Multiplex Unit? Manufacturer & Model?
PostPosted: Nov Tue 28, 2017 1:42 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 17953
Location: Warner Robins, GA
I have an Ampex model 520 MPX decoder that works quite well after restoration.

Concerning the FM tuners the IF has to be able to pass up to 53KHz audio in order to have proper stereo separation.


Top
 Profile  
 
Post New Topic Post Reply  [ 8 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 6 guests



Search for:
Jump to:  


















Privacy Policy :: Powered by phpBB