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: 3,122
Threads: 57
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: 15,444
Threads: 539
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: 3,122
Threads: 57
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: 4,639
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: 3,122
Threads: 57
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: 3,122
Threads: 57
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: 2 Guest(s)
|
Recent Posts
|
PT-6 antenna connections
|
Thanks. I never realized that was a notch noted in the schematic as described. I’ll recheck my wiring.bridkarl — 08:13 PM |
Cannot Adjust an IF Transformer’s cores
|
Thank you! I was quite new to the Phorum when I started this post, so I feel like it might be advantageous to publish a ...jrblasde — 08:07 PM |
PT-6 antenna connections
|
Notice in the schematic the notch at the bottom of the antenna coil is between pins 3 & 4.
Yes, pin 6 of the 7C6 is...RodB — 07:34 PM |
bridkarl
|
I have two PT-6 chassis. On both there is a blue wire that runs from the above chassis transformer to pin 6 of 7C6. So t...bridkarl — 07:23 PM |
Cannot Adjust an IF Transformer’s cores
|
Joseph, now you are an engineer!!RodB — 06:37 PM |
PT-6 antenna connections
|
Hi, reading your explanation I can see the confusion. If you take it one connection at a time it should result in a desi...RodB — 06:34 PM |
Cannot Adjust an IF Transformer’s cores
|
It works! I received the PCBs this morning in the mail, and put everything together. I reused the base from the original...jrblasde — 04:32 PM |
PT-6 antenna connections
|
I seem to have lost my way on this PT-6.
I see the antenna aerial transformer schematic - I’m reading pins 1 through ...bridkarl — 12:30 PM |
40-150 General questions
|
Good thing you're a good electrician ... the pictures show a lot of rewiring in your future! Take care and BE HEALTHY!...GarySP — 11:52 AM |
40-150 General questions
|
I think RobB has it right. It is a part number and looks like its stamped on the chassis and that wasn't something you ...klondike98 — 11:41 AM |
Who's Online
|
There are currently 3236 online users. [Complete List] » 5 Member(s) | 3231 Guest(s)
|
|
|
|