1963 Philco

[Bill R]

I am not sure adding a cap is the right thing to do. Yes it makes it work, but consider this, at one time the set worked without the cap. You might want to do some more troubleshooting before you call this one fixed. Start by checking the simple things, like tube shields, tube sockets, and especially ground connections. Be sure to resolder all the grounds where the circuit board connects to the chassis. These can cause some strange intermittent problems. Double check all the voltage and resistance readings, and you may need to get the scope out when it is acting up to find out what the problem really is. Just a thought.
Bill R.

[wa2ise]

Originally Posted by Bill R

I am not sure adding a cap is the right thing to do. Yes it makes it work, but consider this, at one time the set worked without the cap.

If it's a new or replacement crystal, it may have a different characteristic, and that the manufacturer intended it to have different capicitive loading. Crystals come in different flavors, paralle or series resonant, and so on. So the extra cap may be called for.

[Don Lindsly]

Have you gone through the chroma oscillator alignment procedure? It's fairly simple. Whatever does not respond properly will usually point to the trouble. It does not require a scope or any test equipment.

[Bill R]

Originally Posted by wa2ise

If it's a new or replacement crystal, it may have a different characteristic, and that the manufacturer intended it to have different capicitive loading. Crystals come in different flavors, paralle or series resonant, and so on. So the extra cap may be called for.

This is very possible since the replacement came from a much newer set. You just want to be sure everything else is as it should be to avoid any future problems.

Bill R