Thanx Brian
Be sure bypass caps are good and tubes have shields. Try reversing your 2 - 24 tubes. One is used as oscillator and may be weak. An oscillator stops at the high end of a band first.
Norm
: Hi I am working on a friends 1933 Deforest Crosley "model 500" Encore Model and I replaced the filter caps and have it going now I do get some radio the low stations come in quietly and I can turn it up full but stations are not very loud and until 3/4 of the way up on the volume I get nothing. I go up to about 980 Khz and then stations get really loud and then the speaker oscillates and then when the volume is at 3/4 or higher it cuts out when you turn it above the oscillations point kind of like the pot wiper ceases connection but that is not the case. The audio just dies. Then when I turn it down to the same area it pops back into oscillation. It is like the volume only works in a small area on the pot. At least up on the higher stations. The lower stations don't have this problem but they are much quieter. I checked the pot and it is fine. Even replaced it and same thing. The speaker definately starts oscillating when turned up to the breaking 3/4 point then "pop" it cuts out. It doesn't do this on the mid to low frequency stations though but the volume is weak. It uses a 35 then a 24 then another 35 then a 24 then a 47 class A single ended output. I have the schem. Just wondered if this problem sounded familiar to anyone on the page? I am going to re examine the DC conditions tomorrow.
: Thanx Brian
: Hi I am working on a friends 1933 Deforest Crosley "model 500" Encore Model and I replaced the filter caps and have it going now I do get some radio the low stations come in quietly and I can turn it up full but stations are not very loud and until 3/4 of the way up on the volume I get nothing. I go up to about 980 Khz and then stations get really loud and then the speaker oscillates and then when the volume is at 3/4 or higher it cuts out when you turn it above the oscillations point kind of like the pot wiper ceases connection but that is not the case. The audio just dies. Then when I turn it down to the same area it pops back into oscillation. It is like the volume only works in a small area on the pot. At least up on the higher stations. The lower stations don't have this problem but they are much quieter. I checked the pot and it is fine. Even replaced it and same thing. The speaker definately starts oscillating when turned up to the breaking 3/4 point then "pop" it cuts out. It doesn't do this on the mid to low frequency stations though but the volume is weak. It uses a 35 then a 24 then another 35 then a 24 then a 47 class A single ended output. I have the schem. Just wondered if this problem sounded familiar to anyone on the page? I am going to re examine the DC conditions tomorrow.
: Thanx Brian