[Phil27]

Thanks very much Rod. I know I’ll be back with other questions but in the meantime I appreciate the quick response.

[Phil27]

Rod
I assume you meant the 130 ohm resistor when you wrote 300 ohm resistor.

[RodB]

Yes, that's correct.

[Phil27]

I’m missing Bakelite block part #97, a 6287F. I have a spare block, do I just solder in one side of each of the .15 caps to either side of the filter choke? The Philco Library shows two .15 caps for the 6287F.

I was also checking my filter choke and audio transformer for ohm readings. I got 84 ohms on part 96, the filter choke. Not sure what it should be. I don’t see anything written on the schematic I have. 

On the audio transformer the photo shows the readings I got. All good except nothing between pin 4 and any of the other tabs so I’m assuming the transformer is toast. Any suggestions as to a replacement or is there some way to work around this. I’m in unfamiliar territory.

[RodB]

I only found one instance of part 97 so one of the caps must not be used. The other one across the filter choke is not required.

Unfortunately it appears the primary of the transformer (83?) is open. This is very common for this transformer for this period. There's a slight chance it may be a loose connection between one of the wire leads and the coil wire. You can open the transformer and peel away the outer layers of paper to examine the wires. They will be soldered to the coil wires. I do happen to have one I just pulled from a chassis. Not sure how close a match it is but I can check. There's a work around that uses a coupling cap and the transformer secondary. It's in the Phorum library. I'm using the workaround in my Philco 650 and it sounds just fine. If you use it, be sure to completely disconnect the primary from the circuit.

[Phil27]

As far as the I am referring too, it’s part #97, a .3 mfd bakelite block. The philco literature on bakelite blocks indicate that it is a duo .15 block. The previously posted photo which shows my large wire wound resister, shows the indentation of the lockwasher that was securing a block at one time. I just wanted confirmation on whether my plan to wire lugs 2 and 3 of a replacement block to either side of the filter choke was correct.

It is not the block for the primary, I haven’t gotten to that yet.

[RodB]

Got it, two 0.15s in parallel. Like I said, that cap across the filter choke is not required, but yes, you can wire it in. Let me know when you get to the power transformer primary block.

[Phil27]

Thanks Rod, I will.

[Phil27]

I need some advice on the two enclosed photos. The first shows a 8k resistor, part #42 and a 2 meg resistor, part #41. They are braided together at the one end and then soldered to ground on the bakelite block. 

The second photo is a 500 ohm resistor part #14, and a .03cap (should be .05) part #15. Although it’s hard to see, these two are also braided together and both ends and then soldered at a common point.

Is this common and does it effect the values of either the cap or the resistors when they are together in this manner? The .03 cap is not original but the two resistors in the first photo look original. 

I haven’t come across this before and I’m just trying to get a handle on how things were done and why they would have installed the parts in this manner.

[morzh]

Yes, Philco did this twisting parts and, no, that does not affect anything. Just a way to connect parts.

[RodB]

This is fairly common when two components near each other are to be connected to the same point. Saves wire space on terminals and can be set up prior to installation. If you look at the schematic, the two resistors in the first photo both connect to the tube socket on one end and ground on the other. The schematic shows the resistor 14 attached to the cathode and the capacitor 15 is in parallel with the resistor and the photo shows this to be true. Now sit back and have a sip of your favorite beverage, everything is copacetic.

[Phil27]

Thanks gentlemen. I’m starting on the Bakelite blocks.

Rod you had mentioned about the power transformer primary block. I do have 2 .015 safety caps for that. Are there other concerns I should be aware of regarding that Bakelite blocks?

[RodB]

Yes, use Y safety caps and you should rewire the block to do it's thing after the power switch has been turned on. It's wired right now to be active when the radio is plugged in. Maybe Mike can add his 2 cents.