Posts: 228
Threads: 64
Joined: Dec 2013
City: Northbrook, IL
There is a set available, regular thing, hum, etc,etc. Cabinet appears to be easily restored. I think I can get it for less than $200.00.Do not know much about those sets. Opinions?
Thanks in advance.
Posts: 3,133
Threads: 56
Joined: Apr 2011
City: Lexington, KY
The AK 84 was their first cathedral style radio, and while not as ornate as later offerings such as the model 82, it is still considered a beautiful cabinet.
Price is dependent on condition of chassis and cabinet, and I'm not sure what you consider "easily restored", but in decent shape under $200 sounds like a very good price.
I would not plug it in again until, at the least, the filter capacitors are replaced, or that hum may turn into a transformer smoking. Good luck, the AK 84 is a very nice radio and one of my favorites.
John KK4ZLF
Lexington, KY
"illegitimis non carborundum"
Posts: 2,353
Threads: 92
Joined: May 2010
City: Clayton, NC
Agree, a model 84 in decent shape is worth 200.00
Posts: 15,527
Threads: 545
Joined: Oct 2011
City: Jackson, NJ
If it is in decent shape.....I have not seen any below 300 on eBay and in Kutztown they were $350 the lowest; none sold though but the owners do stick by the price and won't budge.
So....yes, below $200 seems like a good deal.
Posts: 228
Threads: 64
Joined: Dec 2013
City: Northbrook, IL
Which manufacturer supplied tubes for AK 84? I have some 24 and 27 but they are Philco.
Posts: 3,133
Threads: 56
Joined: Apr 2011
City: Lexington, KY
I think they usually used Cunningham tubes, but that probably would not have been an absolute rule.
John KK4ZLF
Lexington, KY
"illegitimis non carborundum"
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
I had heard that AK used both RCA and Cunningham. Same tubes.
Posts: 4,657
Threads: 51
Joined: Sep 2008
City: Sandwick, BC, CA
One thing to watch for on some of the A.K cathedrals are bad power transformers, I can't remember whether a model 84 is one of them or not. With luck the one in this set may have been replaced, rewound, or may be a 25 cycle one.
Regards
Arran
Posts: 228
Threads: 64
Joined: Dec 2013
City: Northbrook, IL
If I have an original weak globe RCA 80 and instead of paying for the single tube almost 1/3 of the radio price went with a full wave diode rectifier under the chassis (keeping the tube as a decorative, lit filament piece, of course), which diodes(##) are most suitable for an application?
That is if someone have already done so. Thanks.
(This post was last modified: 05-27-2014, 09:40 AM by fields 100.)
Posts: 1,114
Threads: 14
Joined: Feb 2013
City: Irvington, NY
I would not recommend it. First, the diodes have a very low forward drop, so unless you add series resistors you will end up with high B+ voltage. The tube 80 also acts as sort of a fuse, in that under momentary overload it will limit the transformer current to a safer value than a silicon diode. With a short on the B+ line the plates of the 80 may glow red, but if shut off quickly, likely no damage will result.
How bad is your 80? Sometimes a weak 80 still has enough emission to provide rated B+ voltage to the radio, especially with today's higher line voltage
Posts: 3,133
Threads: 56
Joined: Apr 2011
City: Lexington, KY
Personally I wouldn't bother doing that with a tube as readily available as an 80. You can get a new 80 for $12 or good used for $6:
https://docs.google.com/spreadsheet/ccc?...0foD#gid=4
It won't be a globe but it won't require kludging in diodes and resistors under the chassis either. Keep your eyes open and you'll eventually find a good globe 80 on eBay, a radio meet, an old parts set, or a wanted ad. There is no shortage of globe 80's out there if you're patient.
I'd also measure B+ with a good 80 and then your weak one; often a weak 80 isn't that far off, depending on the parameters of the tube tester used.
If you're still determined you can use two 1N4007's and a wire wound resistor to drop the B+ down to what it measures with a known good 80 in the circuit.
John KK4ZLF
Lexington, KY
"illegitimis non carborundum"
Posts: 228
Threads: 64
Joined: Dec 2013
City: Northbrook, IL
It is in the yellow field, about 55-56.I have not tried it yet on this radio. So, if the B+ within a spec.,I can use it, right?
But the diodes are definitely out. Hiding tiny diodes is one thing, but the wire resistor...
Thanks, guys.
(This post was last modified: 05-27-2014, 12:25 PM by fields 100.)
Posts: 3,133
Threads: 56
Joined: Apr 2011
City: Lexington, KY
Yes, it should be fine if the B+ is OK. Just make sure you change out the filter and paper capacitors before firing it up.
John KK4ZLF
Lexington, KY
"illegitimis non carborundum"
Users browsing this thread: 1 Guest(s)
|
Recent Posts
|
Correct model 84 Ac plug an cord type
|
From what I read Philco went to using brown rubber power cords in 1936, so cloth was used in the 1935 and earlier models...Arran — 11:25 PM |
Correct model 84 Ac plug an cord type
|
Hi Bruce,
I have not worked on an 84, but in general, power cords for almost any radio prior to 1938 was cloth covered...MrFixr55 — 08:34 PM |
Restoring Philco 38-14
|
OK, well, so after staring at the sch again, I realized the problem had to be the #12/12A padder.
I put a scope on the o...morzh — 08:15 PM |
Correct model 84 Ac plug an cord type
|
Hello Bruce,
I mostly use brown far as my cloth powercords go !
Here is the plug that I have used bakelite Acorn style...radiorich — 08:05 PM |
Correct model 84 Ac plug an cord type
|
Looking for as correct as can find the right Ac plug an the correct colored cloth line. Ive seen many old photos but mos...Bruce — 04:13 PM |
Restoring Philco 38-14
|
Rod
Two Y-caps make sense if you use them from L/N to the chassis; this is only makes sense in the transformer radios...morzh — 10:11 AM |
Restoring Philco 38-14
|
Mike, I'm curious about a specific use of he Y cap. Lately I've seen a single cap across the power transformer primary. ...RodB — 09:01 AM |
Restoring Philco 38-14
|
hello morzh ,
That sounds like a plan !
Sincerely Richardradiorich — 07:45 AM |
Restoring Philco 38-14
|
Richard,
It helped some, but I still had the whining when engaging the rear power strip (I did not realize it was fro...morzh — 07:07 AM |
Restoring Philco 38-14
|
Hello morzh,
Yes , that dreaded hum in my room where i do alighment I have my cable modem and router plus desktop plus ...radiorich — 11:25 PM |
Who's Online
|
There are currently no members online. |
|
|