Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

RCA R-8 Chassis Rebuild
#8

(07-16-2016, 04:28 AM)palegreenthumb Wrote:  Wow Russ, hard to believe that's the same radio!

What's your take on casting 2W resistors into dogbone molds? Are they still able to dissipate 2W, or are they derated a bit?

I have been doing this for years now. I have only had one get hot enough to damage the molded material and it was the result of another failure. The idea is that you replace a 1/2w with a 2W or larger to better dissipate any heating, most of which leaves by way of the leads anyway.

But, yes. I would not run them at 2w. I have used 3.8w wire-wound when I thought heat would be a problem. This increases the cost by about 10X. These resistors (the ww) are the same size as a 2w metal (blue) so are sized to cast into a 1/2w dogbone or larger.

"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/


Messages In This Thread
RCA R-8 Chassis Rebuild - by Phlogiston - 07-15-2016, 10:48 AM
RE: RCA R-8 Chassis Rebuild - by KCMike - 07-15-2016, 12:16 PM
RE: RCA R-8 Chassis Rebuild - by Eliot Ness - 07-15-2016, 03:17 PM
RE: RCA R-8 Chassis Rebuild - by klondike98 - 07-15-2016, 07:05 PM
RE: RCA R-8 Chassis Rebuild - by Paul Philco322 - 07-15-2016, 09:27 PM
RE: RCA R-8 Chassis Rebuild - by Arran - 07-16-2016, 04:22 AM
RE: RCA R-8 Chassis Rebuild - by Phlogiston - 07-16-2016, 11:03 AM
RE: RCA R-8 Chassis Rebuild - by palegreenthumb - 07-16-2016, 04:28 AM
RE: RCA R-8 Chassis Rebuild - by Phlogiston - 07-16-2016, 10:57 AM
RE: RCA R-8 Chassis Rebuild - by Arran - 07-18-2016, 03:13 AM
RE: RCA R-8 Chassis Rebuild - by Phlogiston - 07-18-2016, 11:01 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Graphics for majestic 1050 dial glass.
Murf; I found this thread on the ARF, the first photo has a pretty good view of the dial glass. Regards ArranArran — 01:12 AM
Zenith H725
hello Ed, how about that speacial tape used for ducting it's like foil or how about thin piece of aluminum roof flash...radiorich — 12:19 AM
Zenith H725
Ed; One material that I have seen, but never tried for this was material for making exhaust gaskets, it's similar to ...Arran — 11:42 PM
Zenith H725
I just remembered, I have some hi temp silicone rubber material which could do the trick. Or a piece of FR4 laminate. Th...EdHolland — 08:39 PM
Zenith H725
The PSU filter cap arrived today (thank you USPS!) so I will work on that later. Meanwhile, I have the dial, speaker...EdHolland — 06:42 PM
Philco 610B oscillator wiring
Thanks Terry. After checking my notes I think I recorded about -10v at the 6A7 G4/control grid. The screen grid (G3 &...Tubester — 05:59 PM
The list of my radio & TV collection!
Magical chords of forgotten melodies, old nostalgic music on an old radio... Saturday night blues on the Mid-Waves on an...RadioSvit — 12:20 PM
Philco 42-345 Restoration/Repair
Thank you MrFixr55 the issue with this radio is that the internal coil antenna is missing and there was a wire in its pl...osanders0311 — 11:34 AM
Philco 610B oscillator wiring
Regarding the oscillator circuit which is comprised of the 6A7's cathode, control grid, and screen grid. These elements ...Radioroslyn — 10:33 AM
Philco 42-345 Restoration/Repair
Hi OSanders, First off, welcome to the Philco Phorum where Phine Phamily-Phriendly Pholks Phull of Philco Phacts and P...MrFixr55 — 08:41 AM

[-]
Who's Online
There are currently no members online.

>