Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
Hi guys,
I just did a recap on this Hippo. I even replaced most of the mica caps as well as a good amount of out of range resistors. The tubes have been tested and I replaced 2 of them. Performed an alignment.
Reception is great but between stations there is a VERY noticeable squeal. Any ideas where to look?
http://www.nostalgiaair.org/Resources/634/M0013634.htm
Thanks
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 674
Threads: 146
Joined: Jun 2011
City: Elko,MN.
I have run into this before, and have been able to get rid of it by fine tuning the alignment.
murf
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
Is your loop antenna properly connected? If one wire is disconnected, the set will squeal, howl, buzz, and in general not play correctly.
--
Ron Ramirez
Ferdinand IN
Posts: 1,703
Threads: 55
Joined: Sep 2005
City: Evanston, IL
If your loop is connected you may also try a slight stagger-tune of the I.F.'s as suggested above.
Chuck
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
It came with no antenna. The loop is connected but it is from what I think was a 46-250. Would that make the difference? If so what can be done to correct this?
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 16,571
Threads: 574
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
If it squeals on you tell it it is not an honorable thing to do.
And make sure it is loop and not a noose 
Now on teh seriuous note, I only have the sch for 48-620, but if it is also an AC/DC set, there is a capacitor or a capacitor in series with small inductance conencting the electrical common and RF common (chassis). If this cap or inductor are bad the radio will misbehave including squealing, howling, roaring, motorboating and occasionally uttering some bad words on its own at which point you should turn it off, pull the belt from your pants, give it a good threshing and then inspect for bad parts and re-align.
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
OK Morzh, here is the schematic for the 48-460
48-460
Would it be C5?
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
Something else that I just discovered: With the antenna disconnected I get a soft high pitched squeal that changes with volume but doesn't change with movement of the tuning cap.
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 16,571
Threads: 574
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
No. C19.
But C5 is also worth checking as without it the antenna will simply not work.
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
C5 is new. Any idea why there is a soft squeal with no antenna connected?
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 16,571
Threads: 574
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Is C19 new or is it even there?
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
Yes it is there. I have 2 schematics. This one shows a .2mf and the other shows a .5mf. I used a .5 because that is what was in there. It didn't have the wire wrapped around it. I don't think that is needed anymore. Is it?
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 16,571
Threads: 574
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Did it have a wire wrapped around it before?
0.2uF or 0.5uF does not matter, it is an RF link cap between the two commons, either will work fine.
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
No wire, so I tried one. No change.
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 761
Threads: 56
Joined: Jul 2013
City: Kentucky
Hippos usually have rubber wiring. Did you replace any wires, or cover them with heat shrink? If so, check the routing of the wires. Sometimes solving a squeal is as simple as moving a wire 1/4 inch. If this isn't the trouble, i think your alignment might be a little too "hot". Like Chuck said, un-align it a little and see if the squeal stops.
The artist formerly known as Puhpow! 8)
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
Table radio 51C or 52C?
|
| I would love to see the underside of that set, good luck and when you get that all cleaned up and running you will have ...Paul Philco322 — 03:17 PM |
|
Table radio 51C or 52C?
|
| >>> Curious how this thing is getting 5V and 2.5V.
Not sure I understood. There is that power transformer, it...morzh — 03:12 PM |
|
A Marconi model 86
|
| I have noticed that Marconi cabinets, from that era, didn't really go overboard with the shading lacquer, at least on th...Arran — 02:16 PM |
|
Table radio 51C or 52C?
|
| I realize there is a lot of butchery going on here to get it playing. I plugged it in and it didn't play! LOL But al...antiqueradionut — 01:23 PM |
|
A Marconi model 86
|
| I like your approach to the dark finish. IMO to much dark finish hides some of the features of the cabinet. I used dark ...RodB — 12:22 PM |
|
A Marconi model 86
|
| Thanks
I also have some arthritis in my hands, and it is getting a little harder to lift these radio cabinets
on and...Dan Walker — 10:01 AM |
|
A Marconi model 86
|
| Dan, I love your cabinet work. If you enjoy it, do as much as you can now. I used to have the physical ability but my ba...RodB — 09:51 AM |
|
A Marconi model 86
|
| Hi Paul;
The grill pillars were quite easy to take out .They only had a rear nail in the top rear of each one.
...Dan Walker — 09:50 AM |
|
Philco 45L Initial Check Up
|
| The 45L I found had been kept in one house in the "parlor" for most of its life. It was in pretty nice shape e...Paul Philco322 — 09:45 AM |
|
A Marconi model 86
|
| I like how the grille work is so sturdy yet pretty. So many radios with delicate grille work get broken and are hard to ...Paul Philco322 — 09:40 AM |
|
Who's Online
|
There are currently 742 online users. [Complete List]
» 1 Member(s) | 741 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
