1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration

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

Linear Mode
model 84 speaker replacement
fenbach
Member
***
Posts: 143
Threads: 28
Joined: Dec 2016
City: portland, OR
#4

09-23-2020, 05:24 PM
nice try falcon123, but i don't think an 84 is worth the cost of a full restoration, including a recone of the speaker and a new dial face at the least for this one. that said, the cabinet is in exceptionally good condition. no damage whatsoever [in case someone is interested].
but now i'm interested in knowing just how critical the speaker impedance is. would i even notice a difference in sound quality with a modern 4 ohm speaker? at my age, that is Icon_smile . and if it is an issue, could i fake it by just putting a resistor in parallel with the speaker?
then, speaking of the impedance, is a simple resistance reading anywhere close? and if not, at what frequency should i calculate the impedance? from the inductance, which i find by setting up a tank circuit. i "ping" the circuit thru a diode at a low frequency, read off the resonant frequency on an oscilloscope and compute the inductance.
(This post was last modified: 09-24-2020, 12:30 AM by fenbach.)
Find
« Next Oldest | Next Newest »
Thread Closed


Messages In This Thread
model 84 speaker replacement - by fenbach - 09-21-2020, 08:01 PM
RE: model 84 speaker replacement - by RodB - 09-21-2020, 08:41 PM
RE: model 84 speaker replacement - by falcon123 - 09-22-2020, 06:13 AM
RE: model 84 speaker replacement - by fenbach - 09-23-2020, 05:24 PM
RE: model 84 speaker replacement - by Radioroslyn - 09-23-2020, 06:33 PM
RE: model 84 speaker replacement - by falcon123 - 09-23-2020, 08:48 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Need to purchase some accessories for restoration of my Old Philco Radio
Hi Paulo, Welcome to the Philco Phorum. I can see why you want to find good reproduction parts. That is a bea...MrFixr55 — 11:10 PM
HiFi (Chifi) tube amp build - but my own design.
Tim, I have some bakelite sockets in my work shop that I can dig up. I believe quite a few are NOS. I will take photo...RodB — 10:03 PM
Philco 610B oscillator wiring
> The cathode as noted is wired directly to the ground side of the heater filament for that tube, not to the #17 and ...Radioroslyn — 08:12 PM
HiFi (Chifi) tube amp build - but my own design.
Tim; I noticed your post a little late, but I would take one of the junk sockets and try to break a chunk out of it wi...Arran — 08:07 PM
Need to purchase some accessories for restoration of my Old Philco Radio
Here is a list of resources found in our online library that you might find useful. Mike's Gobs of Knobs email addres...klondike98 — 01:46 PM
First Radio restoration
Hi Tubeman, Welcome to the Philco Phorum.  Phamily Phriendly Pfun with Phine Pholks Phull of Philco Phacts. (See a p...MrFixr55 — 12:33 PM
First Radio restoration
You could post in the WANTED ADs section here on the Phorum and see if anyone has an RF generator that they want to sell...klondike98 — 11:55 AM
Zenith H725
Good ideas, thank you Arrange and Rich. I have the adhesive aluminum foil already and can try that immediately. More ...EdHolland — 10:18 AM
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

[-]
Who's Online
There are currently 2059 online users. [Complete List]
» 4 Member(s) | 2055 Guest(s)
AvatarAvatarAvatarAvatar

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration