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


It is currently Dec Sat 16, 2017 12:39 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 7 posts ] 
Author Message
 Post subject: Lafayette LR-1500T weak channel?
PostPosted: Nov Sun 26, 2017 7:18 pm 
Member
User avatar

Joined: Mar Tue 28, 2017 4:51 pm
Posts: 212
Location: Wayne, NJ
Hi all,
I just picked-up a really nice Lafayette LR-1500T in a wood case and although it sounds great with the balance set in the middle, when you move the balance to the left the audio disappears and when you move it to the right the audio screams way more than normal, put it back in the middle and both channels sound great......is this a cap or transistor issue?

_________________
Cheers, Steve
"Just a cap away from success!"


Top
 Profile  
 
 Post subject: Re: Lafayette LR-1500T weak channel?
PostPosted: Nov Sun 26, 2017 8:04 pm 
Member
User avatar

Joined: Nov Sat 07, 2009 11:37 pm
Posts: 1775
Location: Sayreville, NJ 08872
More info required:
What position is the Mode switch in?
What position is the Selector switch in? (What are you using for a signal source?)
Is the Tape Monitor switch in the Off position?
Using left & right speakers or stereo headphones?
Is Loudness switch Off?

_________________
Pete, WA2CWA - "A cluttered desk is a sign of genius"
http://www.classicradiomanuals.com


Top
 Profile  
 
 Post subject: Re: Lafayette LR-1500T weak channel?
PostPosted: Nov Sun 26, 2017 10:17 pm 
Member
User avatar

Joined: Mar Tue 28, 2017 4:51 pm
Posts: 212
Location: Wayne, NJ
manualman wrote:
More info required:
What position is the Mode switch in?
What position is the Selector switch in? (What are you using for a signal source?)
Is the Tape Monitor switch in the Off position?
Using left & right speakers or stereo headphones?
Is Loudness switch Off?



What position is the Mode switch in?= Stereo
What position is the Selector switch in? (What are you using for a signal source?)- Aux with an iPhone......same symptoms in FM mode
Is the Tape Monitor switch in the Off position?= Yes
Using left & right speakers or stereo headphones?= Speakers
Is Loudness switch Off?= Yes

_________________
Cheers, Steve
"Just a cap away from success!"


Top
 Profile  
 
 Post subject: Re: Lafayette LR-1500T weak channel?
PostPosted: Nov Mon 27, 2017 12:32 am 
Member
User avatar

Joined: Nov Sat 07, 2009 11:37 pm
Posts: 1775
Location: Sayreville, NJ 08872
Since you're trying to determine left and right channel functionality, I would only use one input at a time. Put a signal into the left channel only; with some volume setting, rotate balance control from center to left and then to right. Audio should only appear from balance center to left extreme. Now do the same test with the input in the right channel. With some volume setting, rotate balance control from center to right and then to left. Audio should only appear from balance center to right extreme. If you don't hear audio, or it's distorted, in a channel, then that channel has a problem. Note that distortion can also be generated by too high of an input signal so be aware of that too.

_________________
Pete, WA2CWA - "A cluttered desk is a sign of genius"
http://www.classicradiomanuals.com


Top
 Profile  
 
 Post subject: Re: Lafayette LR-1500T weak channel?
PostPosted: Nov Tue 28, 2017 12:19 am 
Member
User avatar

Joined: Mar Tue 28, 2017 4:51 pm
Posts: 212
Location: Wayne, NJ
manualman wrote:
Since you're trying to determine left and right channel functionality, I would only use one input at a time. Put a signal into the left channel only; with some volume setting, rotate balance control from center to left and then to right. Audio should only appear from balance center to left extreme. Now do the same test with the input in the right channel. With some volume setting, rotate balance control from center to right and then to left. Audio should only appear from balance center to right extreme. If you don't hear audio, or it's distorted, in a channel, then that channel has a problem. Note that distortion can also be generated by too high of an input signal so be aware of that too.


Thank you for your input but I was trying to find out that if a channel is "over active" wether it was normally a cap or transistor issue.....

_________________
Cheers, Steve
"Just a cap away from success!"


Top
 Profile  
 
 Post subject: Re: Lafayette LR-1500T weak channel?
PostPosted: Nov Tue 28, 2017 12:26 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 3992
Location: Boston, MA USA
If a channel truly has excessive gain the cause is usually an open capacitor in a negative feedback network. It would not be a transistor.

-David


Top
 Profile  
 
 Post subject: Re: Lafayette LR-1500T weak channel?
PostPosted: Nov Tue 28, 2017 3:54 pm 
Member
User avatar

Joined: Mar Tue 28, 2017 4:51 pm
Posts: 212
Location: Wayne, NJ
dberman51 wrote:
If a channel truly has excessive gain the cause is usually an open capacitor in a negative feedback network. It would not be a transistor.

-David


Thanks!

_________________
Cheers, Steve
"Just a cap away from success!"


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 8 guests



Search for:
Jump to:  


















Privacy Policy :: Powered by phpBB