The Fisher 4400 FM Receiver
Posts: 1,114
Threads: 14
Joined: Feb 2013
City: Irvington, NY
Ron, I don't think the differences in voltages are significant with regard to the low audio issue. One channel is a few volts high, the other a few low, but not really out of the ordinary. This balance issue really does not affect the AC gain of the amp. Otherwise the voltages look reasonable with regard to biasing of the individual transistors.
On thing that will affect the AC gain is the driver feedback bypass cap C26. This cap reduces the AC feedback from the driver stage collector, preventing loss of AC gain while maintaining the DC feedback. If this cap is open, It will reduce the AC gain, which may cause the low volume. You can try bypassing it with the 100 uF cap you have and see if it makes a difference.
Electrolytics are always suspect, so this is where I would look first.
Messages In This Thread
RE: The Fisher 4400 FM Receiver - by Mondial - 02-19-2014, 09:28 PM
Users browsing this thread: 2 Guest(s)
|
|
Recent Posts
|
|
PT 6 chassis screws size???
|
| Hello bridKarl,
that sounds right or maybe 8/32 .
Sincerely Richardradiorich — 01:00 AM |
|
PT 6 chassis screws size???
|
| Have this done except for missing chassis screws.
It looks like 1 inch 6/32 sheet metal screw may work but can anyone s...bridkarl — 10:32 PM |
|
Philco model 38 code 121 not receiving signal.
|
| Hello Stormlord,
Well done on rewinding that coil it turned fairly good for your first one.
Sincerely Richardradiorich — 09:12 PM |
|
Philco model 38 code 121 not receiving signal.
|
| Well here it is. It ain't pretty, but hopefully it'll work.
I checked it with my DMM on continuity and it keeps and r...Stormlord5500 — 08:56 PM |
|
Philco 42-345 Restoration/Repair
|
| Yes, 57 is an electrolytic cap that should be 12 mfd 400 volts according to the parts list from the Phorum library schem...RodB — 06:01 PM |
|
Philco 42-345 Restoration/Repair
|
| Looks like if I am reading it correctly it looks like the silver capacitor#57 that appears to be a replacement is of a l...osanders0311 — 05:09 PM |
|
Philco model 38 code 121 not receiving signal.
|
| Thanks Arran. Yeah this plastic is pretty thin. It's a little thinner than the original stuff. It kinda reminds me of p...Stormlord5500 — 04:37 PM |
|
Testing a speaker and output transformer Trutone A2-G
|
| The equivalent of one short turn is basically the same as that of a shorted load.
If it is the primary's turn, then the ...morzh — 03:53 PM |
|
Testing a speaker and output transformer Trutone A2-G
|
| I've never had an output transformer become shorted, the failure mode is usually an open primary, or in a center tapped ...Arran — 03:52 PM |
|
Philco model 38 code 121 not receiving signal.
|
| As long as the plastic sheeting isn't too thick, I think that the thickness of photographic film would be just about rig...Arran — 03:19 PM |
|
Who's Online
|
| There are currently no members online. |
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
