Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

37-690 Bass Amplification
#10

[Backstory: this beast was recapped decades ago, but the dude screwed up and restuffed every cap block (36) instead of doing them progressively, checking ops as he proceeded. With all the problems I found, I can guarantee this radio never worked after he touched it]

I'm staring at this Philco capacitor block and all of a sudden it occurred to me, "schematic and parts list show there should be two 0.03uf caps in it...and I don't see a lead poking out and connected to the center contacts. Could it be that simple?"

Sure enough, removed the block and only one Brown Drop in there! It was the #143 from the 1st Audio output that he never installed.
Reinstalled everything with the new cap. Man, this baby is LOUD and FULL sounding. Only issue remaining is that it is amplifying the whole whole freq range. At least it has the lower end now that got filtered out in the earlier stages.  Now to figure out what is wrong with the filter choke #104.

RJ Dial
"Radiodial"
Mendocino, CA


Messages In This Thread
37-690 Bass Amplification - by Radiodial - 12-07-2024, 03:43 PM
RE: 37-690 Bass Amplification - by morzh - 12-07-2024, 05:18 PM
RE: 37-690 Bass Amplification - by Radiodial - 12-07-2024, 07:19 PM
RE: 37-690 Bass Amplification - by morzh - 12-07-2024, 07:40 PM
RE: 37-690 Bass Amplification - by Radiodial - 12-08-2024, 12:52 PM
RE: 37-690 Bass Amplification - by morzh - 12-08-2024, 04:36 PM
RE: 37-690 Bass Amplification - by tbone - 12-13-2024, 12:40 PM
RE: 37-690 Bass Amplification - by morzh - 12-13-2024, 02:18 PM
RE: 37-690 Bass Amplification - by Radiodial - 12-13-2024, 03:38 PM
RE: 37-690 Bass Amplification - by Radiodial - 12-13-2024, 10:12 PM
RE: 37-690 Bass Amplification - by morzh - 12-13-2024, 10:38 PM



Users browsing this thread: 3 Guest(s)
[-]
Recent Posts
The list of my radio & TV collection!
Hello Peter, Thank you for posting that !! Sincerely Richardradiorich — 09:40 AM
Eico 232 VTVM Schematic
It's a microwave antenna. ?;-p?. I substituted 1N4002s off the 6.3 vac winding for the 1.5 volt battery. Uniprobe is the...RodB — 05:50 PM
Eico 232 VTVM Schematic
Try BAMA for a schematic. Looks like a replacement power source for the D battery has been installed. The tube may be...Chas — 04:51 PM
Eico 232 VTVM Schematic
Is that a battery holder?morzh — 04:43 PM
Eico 232 VTVM Schematic
A friend gave me this Eico 232 VTVM and I'm having trouble locating the schematic for it. This one seems to be a later v...RodB — 04:17 PM
Var resistor id
Considering what it is in series with, I doubt there should be any power requirements. Of course, we should know wher...morzh — 03:23 PM
Var resistor id
Trim pot, about 1/2 watt part of focus divider. As stated 2k ohms. This appears to be a rusty chassis, resolder all ...Chas — 03:19 PM
Var resistor id
Its a Sylvania 400 oscilloscope. here is a clip of r-100. Would be nice to know the current required. Not listed in part...Martinj — 02:10 PM
The list of my radio & TV collection!
Thanks Richard. I hope you enjoy it. Here I have created an English section on the history of radio with videos in Engl...RadioSvit — 10:23 AM
The list of my radio & TV collection!
Hello RadioSvit, first all happy new year ! I will watch your new videos this week. Sincerely Richardradiorich — 09:19 AM

[-]
Who's Online
There are currently 9622 online users. [Complete List]
» 1 Member(s) | 9621 Guest(s)
Avatar

>