02-11-2016, 09:46 PM
Hello
I could use some help with this 37-650 floor model,I took on this repair for an older lady,the set belonged to her father,not working when I brought it home so first I checked all tubes changed the power cord,then I changed the large caps and all of the paper caps I could get at and changed about 6 resistors,I did not change the paper
caps under the tuner because I could not get at them.I replaced the bad tubes and the output transformer
with a old one I had, the one in the set was open on one side,then I powered it up ,worked fine and sounded great
with lots of volume.I refinished the cabinet and put it back together ,ran it many times for a few hours at a time
no problem so I took it back to the lady.She ran it off and on for about two weeks and it stopped ,had very low
if any sound at all.I went back with some spare tubes ,I lost track on what tubes I changed but the set
started to work again,it played great for about three weeks then quit again,same thing very little if any
sound,one thing I noticed that when it stopped playing the shadow meter did not move like it did befor.I have
the set back home again,powered it up and it plays great,not knowing what to check now I changed the
output transformer and put in a new one,I put my very small round file down every tube pin hole and with
a tooth pick put dioxit contact cleaner in every tube pin hole.The reason I changed the output transformer
again was I had a set after trying every thing found out it was the output transformer,I was told by a
fellow to try it because some times when the copper wire in them separates it leaves a carbon track
that will allow the set to work until it gets hot enough to separate again,then it will cool and work
again,that was 6 years ago and the set is still fine.I now have the set on the bench working and while
running I have tapped every joint and move every wire thinking there must be some thing loose,I
wish I could move some thing and have it stop but no luck,I did change one more resistor # 36,the
schematic calls for a 190 K but this thing test at 539 K,the colour on it is yellow body with a white
or cream strip around one end,is 190 K correct or am I reading it wrong,never seen one that far
off befor,I am going to let the set run for as long as I can every day to test it,I don,t want to take it
back only to have it stop again,that won,t be good.If anyone has any idea on what else I could check
please please help me out,I am going to try to post a link to Nostalgia air for the schematic but I don,t
have much luck with that,anyway thanks for your time and for any help you can give,I must say that
set sounds great when working and the cabinet turned out great ,all the very best Rick
PS -I will send the schematic on a new thread
I could use some help with this 37-650 floor model,I took on this repair for an older lady,the set belonged to her father,not working when I brought it home so first I checked all tubes changed the power cord,then I changed the large caps and all of the paper caps I could get at and changed about 6 resistors,I did not change the paper
caps under the tuner because I could not get at them.I replaced the bad tubes and the output transformer
with a old one I had, the one in the set was open on one side,then I powered it up ,worked fine and sounded great
with lots of volume.I refinished the cabinet and put it back together ,ran it many times for a few hours at a time
no problem so I took it back to the lady.She ran it off and on for about two weeks and it stopped ,had very low
if any sound at all.I went back with some spare tubes ,I lost track on what tubes I changed but the set
started to work again,it played great for about three weeks then quit again,same thing very little if any
sound,one thing I noticed that when it stopped playing the shadow meter did not move like it did befor.I have
the set back home again,powered it up and it plays great,not knowing what to check now I changed the
output transformer and put in a new one,I put my very small round file down every tube pin hole and with
a tooth pick put dioxit contact cleaner in every tube pin hole.The reason I changed the output transformer
again was I had a set after trying every thing found out it was the output transformer,I was told by a
fellow to try it because some times when the copper wire in them separates it leaves a carbon track
that will allow the set to work until it gets hot enough to separate again,then it will cool and work
again,that was 6 years ago and the set is still fine.I now have the set on the bench working and while
running I have tapped every joint and move every wire thinking there must be some thing loose,I
wish I could move some thing and have it stop but no luck,I did change one more resistor # 36,the
schematic calls for a 190 K but this thing test at 539 K,the colour on it is yellow body with a white
or cream strip around one end,is 190 K correct or am I reading it wrong,never seen one that far
off befor,I am going to let the set run for as long as I can every day to test it,I don,t want to take it
back only to have it stop again,that won,t be good.If anyone has any idea on what else I could check
please please help me out,I am going to try to post a link to Nostalgia air for the schematic but I don,t
have much luck with that,anyway thanks for your time and for any help you can give,I must say that
set sounds great when working and the cabinet turned out great ,all the very best Rick
PS -I will send the schematic on a new thread
