Westinghouse H840CK15

[benman94]

I am gathering up tubes to send along with the chassis when Nick restores it. The cascode RF amp is listed as either a 6BQ7A or a 6BZ7. I know they're interchangeable, but I'd like to know which should give a better noise factor. I plan on taking the set up to Sault Ste. Marie to DX some Canadian analog repeaters once it's working properly. I just have to see it working the way it would have in 1954 with a proper antenna etc.

The other, more troublesome, tubes are in the chroma. The service manual lists the R-Y and B-Y demod tubes as being either type 6AS6 or 6DB6. It also specifically states to only replace with the type shipped with the reciever. I have no clue what was in the set originally. Am I correct in assuming that one could stick either tube type in, perform an alignment of the chroma sub chassis, and be fine?

Any guidance is much appreciated...

[Steve D.]

Originally Posted by benman94

I am gathering up tubes to send along with the chassis when Nick restores it. The cascode RF amp is listed as either a 6BQ7A or a 6BZ7. I know they're interchangeable, but I'd like to know which should give a better noise factor. I plan on taking the set up to Sault Ste. Marie to DX some Canadian analog repeaters once it's working properly. I just have to see it working the way it would have in 1954 with a proper antenna etc.

The other, more troublesome, tubes are in the chroma. The service manual lists the R-Y and B-Y demod tubes as being either type 6AS6 or 6DB6. It also specifically states to only replace with the type shipped with the reciever. I have no clue what was in the set originally. Am I correct in assuming that one could stick either tube type in, perform an alignment of the chroma sub chassis, and be fine?

Any guidance is much appreciated...

Ben,

I assume you've checked the cabinet tube chart if available. And also the Sams which I'm including here. Hope this helps.

-Steve D.

[benman94]

Originally Posted by Steve D.

Ben,

I assume you've checked the cabinet tube chart if available. And also the Sams which I'm including here. Hope this helps.

-Steve D.

The tube chart in the cabinet lists both types unfortunately, with neither scratched out. It also lists 3A3 or 1B3 for the HV rectifiers, but has 1B3 scratched out.

I'll look at the Sam's closer. Thanks Steve.

[Steve D.]

Originally Posted by benman94

The tube chart in the cabinet lists both types unfortunately, with neither scratched out. It also lists 3A3 or 1B3 for the HV rectifiers, but has 1B3 scratched out.

I'll look at the Sam's closer. Thanks Steve.

Ben, Sorry. Should have included the Sams top view tube chart. Notice they have the 1B3 & the 6AS6 listed as well as the 6BZ7. Who knows?

-Steve D.