Bakelite block challenge??? - Printable Version
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Bakelite block challenge??? - Dan Walker - 04-21-2015
I am recapping a Philco model 3650.. I got the paperwork concerning the Bakelite blocks from
''the Philco Repair bench.. [Chuck]
I have a block with the numbers 6287DU in the radio.. My paperwork from Chuck only lists block with these numbers..6287CU,,6287ODG,,6287ODU,,6287SG and 6287SU.
All of the blocks listed tell me to use a .15uF
I am concerned with the part 80 in the schematics and it shows the cap to be shows a .03 uF in a bakelite block. I don't know which value to use.
These blocks are a real pain to figure out so I hope someone can help me out.
Thanks Dan in calgary
RE: Bakelite block challenge??? - radiohenry - 04-21-2015
(04-21-2015, 05:07 PM)Dan Walker Wrote: I am recapping a Philco model 3650.. I got the paperwork concerning the Bakelite blocks fromHi Dan,
''the Philco Repair bench.. [Chuck]
I have a block with the numbers 6287DU in the radio.. My paperwork from Chuck only lists block with these numbers..6287CU,,6287ODG,,6287ODU,,6287SG and 6287SU.
All of the blocks listed tell me to use a .15uF
I am concerned with the part 80 in the schematics and it shows the cap to be shows a .03 uF in a bakelite block. I don't know which value to use.
These blocks are a real pain to figure out so I hope someone can help me out.
Thanks Dan in calgary
The 6287DU is a dual capacitor unit. Both values are.015 uf. Looking down on the block with the mounting hole oriented on your left, you will have three strips (terminals) . From left to right call them 1,2, & 3. Wire one cap to strip s 1and 2 the second would be wired to 1 and 3.. If you do not want to melt out the tar and remove the capacitors you can use a drill bit barely larger than the rivet hole in the center of the strips to drill the opening a little larger which will sever the wire connection to the capacitors inside and then just solder the capacitors to the strips ( terminals) .
The blocks are easy to figure out once you understand that they should all be numbered. Knowing the number you can determine the value using the Philco or other data. There are a couple of publications that explain the blocks well and remove all the mystery.
Good luck .
Henry
RE: Bakelite block challenge??? - sam - 04-21-2015
If you use drill bit might as well heat up for few seconds and push tar out
See mikes post about it
Sam
RE: Bakelite block challenge??? - klondike98 - 04-21-2015
Here's the post by morzh that was referred to: http://philcoradio.com/phorum/showthread.php?tid=9107
And here's some additional bakelite block info: http://www.philcoradio.com/tech/images/bakelite.pdf
RE: Bakelite block challenge??? - Dan Walker - 04-21-2015
Thanks for that information, it is very helpful.
I still have a question about the value of the cap in question.. on the schematic it is #80 which says it is a .03 uF.
Maybe I am looking at the wrong block, but in tracking the wires from the heater of the rectifier tube I get them going to a .o3 cap , #80 [ on the schematic] but in that block it tells me that there are .05 caps in there.
I feel that I am missing something here.
RE: Bakelite block challenge??? - klondike98 - 04-21-2015
Dan, I'm on my phone so answering this is a little cumbersome...hope ive got my info right. You have a 3650 which is the Canadian version of US 650 (schematic link). Looking at block cap #80 it does say 0.3uF That probably means the two 0.15uF caps in the block are wired in parallel to yield 0.3uF value. can you show a close up photo on the block#80?
The "U" means that pin 1 is ungrounded. I suspect that pins 2 & 3 are wired together with a jumper wire?? Which gives the 0.3uF cap value. Make sense?
[in your previous post I think you mean to have written 0.3uF and 0.15uF where you have written .03 and .05....]
RE: Bakelite block challenge??? - Dan Walker - 04-23-2015
Well with the help of you guys and a friend who had worked on one of these before I did get things figured out..
Most schematics do show if there is more than one cap in a can or block , but I guess Philco does not do that ... Part #80 on the schematic is actually two .15 caps in a block, but it only shows a .03 cap.. That block number tells me that there are two .15 caps in there ..so I was looking for those two caps on the schematic. THAT is where I got confused.. it's like learning to read a new language. Very confusing '',BUT'' I did learn more about Philcos.
Thanks for the input.
RE: Bakelite block challenge??? - morzh - 04-23-2015
In some, ar least, Philco sch the number of the cap is the number of the backelite block so if there are two inside both will be the same number.
Sometimes it is a cap and a resistor so then both have the same number, and sometimes on the sch it will be one number with arrows pointing to both elements.
Also, while working on a 90 I encountered discrepancies when the sch stays the same but a, say, cap is used from a different block but of the same value. Looked factory. Upon having realized the functionality did not change I left it be.
RE: Bakelite block challenge??? - klondike98 - 04-23-2015
