09-09-2010, 08:00 PM
Good evening,
The R53 tone pot shows as 4 Meg on the schematic but also has 400K written just above the 4 Meg. Is this a drafting error or does it imply that the tone control shaft mechanism should be adjusted so that the minimum resistance should be 400K? Have not seen this before? The tone pot actually measures around 8 meg and appears to be part # 33-5335-1 instead of 33-5325 listed in the parts list?
Is the pot linear of audio taper?
So far have replaced 21 caps., 17 resistors & will replace an open audio output transformer & broken on/off switch. Have these two parts on hand. I am leaning toward being prudent and leaving the pot alone as the 4 thumb wheel mechanisms work well. Have the P.B/tunning unit disconnected from the chassis to replace the on/off switch, "rubber" insulated wiring and clean up as the radio was the home for kitty kats for an extended period of time. How do you get that smell out? The tone pot question would apply to 41-300 & 41-315 units also since they share the same chassis.
Thanks for any assistance.
John
The R53 tone pot shows as 4 Meg on the schematic but also has 400K written just above the 4 Meg. Is this a drafting error or does it imply that the tone control shaft mechanism should be adjusted so that the minimum resistance should be 400K? Have not seen this before? The tone pot actually measures around 8 meg and appears to be part # 33-5335-1 instead of 33-5325 listed in the parts list?
Is the pot linear of audio taper?
So far have replaced 21 caps., 17 resistors & will replace an open audio output transformer & broken on/off switch. Have these two parts on hand. I am leaning toward being prudent and leaving the pot alone as the 4 thumb wheel mechanisms work well. Have the P.B/tunning unit disconnected from the chassis to replace the on/off switch, "rubber" insulated wiring and clean up as the radio was the home for kitty kats for an extended period of time. How do you get that smell out? The tone pot question would apply to 41-300 & 41-315 units also since they share the same chassis.
Thanks for any assistance.
John
