IF PEAK 175 KC

REBALANCING
Do not rebalance a set until you are sure it requires it. 99 per cent of the sets do not need it. We do not find one case in one hundred that really should be rebalanced.

INTERMEDIATES
Connect a 262 K.C. oscillator to the first detector grid (No. 57 tube next to the dial) leaving grid cap in place. Remove oscillator tube (No. 56). Set dial at 100, Hook up vacuum tube volt meter as described and carefully adjust 6 varitor screws for maximum gain (minimum reading of meter). Don't flat top any stages. Have all shields in place. Keep volume control at lowest level.

CONDENSER GANG Set dial at 100 when gang is at maxi. mum position and tighten dial set screws. Tune in a station (or use an oscillator) to a known frequency signal around 1400 K.C. Carefully adjust oscillator section rear of gang until frequency is correct on dial.
If the intermediates are balanced on 262 K.C., the dial will now truck within 5 K.C. over the entire dial.
Adjust first detector section for maximum gain and follow by adjusting band pass trimmers.
Don't bend any condenser plates unless absolutely necessary.

SERVICE DATA
This model has the diode type AVC con. trolling the first detector and the interme. diate frequency stages. The AVC makes it impossible to service and rebalance the set without the proper type of equipment. We advise building a VTVM as shown in the diagram. This meter can be used on any set that uses automatic volume control by connecting the hot lead to the Grid return of the tubes controlled by the AVC. Connect the ground lead to the cathodes of the same tubes. On this 8 - tube model connect the hot lead to the 5 meg, resistor and the ground lead to the chassis.

OVERLOADING OR POOR QUALITY AT LOW VOLUME
The chief cause of this trouble is too long an antenna. A powerful local station will cause the R.F. tubes to block. Check this by disconnecting the antenna on the station causing the trouble. It too close to a powerful station, installing a switch in the aerial circuit helps this. In rare cases the set seems to overload and the A.V.C. works too quickly on all stations.
Check the following:
Disconnect 5 meg. resistor from A.V.C. buss at tie point. Have all tubes cold. Use high voltage, high resistance ohmmeter cap able of reading 25 megohms and test from ground to A.V.C. buss for leakage. After condensers have charged, no leakage should be shown. This must read around 100 megohms to ground.
If slight leakage is observed, disconnect bypass condensers from bubs until defective one is found. Sometimes moisture is found on coil terminals. Scrape this clear. Check tubes for leakage from grid to ground.

NOISY OPERATION (Not Static)
In many cases it is found that the noise cannot be eliminated by servicing the receiver. Noise may enter over the light lines or via the antenna. The only way to check the source is to turn off one after another. all electrical apparatus in the vicinity of the set.