I noted Elton's RCA 87T2 question. Elton and I have the same radio - RCA 87T2. I too have an AM band question - namely where is the the coil L10 to set the dial for 600 KC?

Carl

L10 is part of the A band oscillator coil, which consists of L10, L11, and L12. All you do for the low end adjustment of the broadcast band is adjust the slug within the oscillator coil. There will likely be a screw adjustment protruding from the chassis where the oscillator coil is mounted. This slug will adjust the impedance for all three coils. Only L10 is mentioned, but all three are part of the circuit.

With your radio this may not matter, but it is generally best to adjust the high end of the dial first. This is done by adjusting the oscillator trimmer condenser for the A band so that the designated frequency given in your alignment data will fall on its mark on the dial. Then adjust the low end of the dial with the slug by tuning the dial to 600 KC and then adjusting so that 600 KC comes in on its mark. Check both ends of the dial for aligment and sensitivity. Unless both ends are aligned properly, synchronization will be a problem all over the dial in certain places, and sensitivity may be a problem at the low end of the dial. With some sets, achieving good results all over the dial is difficult without much readjustment. It is best, then, to go for a balance between maximum sensitivity at 550-600 KC and good alignment all over the dial.

Thomas

Perfect IF alignment also adds to proper tracking and sensitivity. This is why it is important to have a signal generator of good quality and condition. Most radios are not too sensitive to minor misadjustments, but some can be, and this can be very annoying.

Generally I use a signal generator for the IF alignment, and actual stations for the oscillator alignment, as they are usually more accurate than my signal generator.

Thomas

Carl, thomas is correct that slug should be on the left when looking at the back of the set, and I think this is the coil that is causing all my problems,and there are multiple taps on this for the SW bands as well, I will have to follow thomas's idea and disconect each and check the resistance on each to see if that is my prolem. boooo!
Elton
:I noted Elton's RCA 87T2 question. Elton and I have the same radio - RCA 87T2. I too have an AM band question - namely where is the the coil L10 to set the dial for 600 KC?
:
:Carl
:

True that, boo! Disconnecting coil wires sux!

In the schematics, I could only find a designation for L12 which is adjusted from the back of the Chassis. There is an "Ant Coil" in front of the 6A8 Tube but there is no adjustment slug for it.

Here is the SD:
http://www.nostalgiaair.org/PagesByModel/183/M0015183.pdf

Carl

L10, L11, and L12 are for the OSCILLATOR coil, not the antenna coil. You adjust the slug on the oscillator coil for 600 KC (so that you pick up 600 KC when the dial reads 600 KC). No adjustments are made to the antenna coil at the low end of the dial. The antenna coil is adjusted at the high end of the dial using a trimmer condenser for the band in question. The specific frequency to adjust the trimmer to is given in your alignment data. At any rate, use the slug that you found on L12, which is also L11 and L10, and adjust this for 600 KC.

Thomas