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

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

Grunow model 580 only tracking on half of tuning cap
#4

The voltages are a little off, but that can just be due to line voltage and to resistor drift. Looking at the pictures of the condenser positions for 620kc and 1470kc they seem a little "unmeshed" for both frequencies, but it is very difficult for me to say since I cannot see the dial scale. I would try a complete alignment, following the instructions given in Riders for that model. http://www.nostalgiaair.org/pagesbymodel...008372.pdf  The notes on the alignment instructions say the proper IF frequency should be stamped on the back of the chassis. It also gives instructions how to check it if it isn't, basically, feed first one, and then the other frequency into the receiver through a 200mmf condenser with the signal from the signal generator on the antenna terminal and the ground to the ground terminal. The correct frequency should give you a signal through. Just read and follow the instructions. I do find it odd that you say the 2 short wave bands work fine and the frequencies are where they should be on the dial. I also noticed that the schematic uses the letter "M" for 1000 ohms, like modern schematics use "K" . It uses "Meg" for megohm, so don't let that confuse you. They did that on some old schematics. It confused me the first time I ran into it.





Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
6TPZ and 5TPO Radio Help
Welcome to the Phorum, R3Sons! I have very limited experience with car radios other than installing custom radios back ...GarySP — 01:08 PM
462ron
OK, I need to rename this thread to say..Eico 368 TV/FM Sweep Generator instead of the current title..Heathkit Sweep Gen...462ron — 12:49 PM
6TPZ and 5TPO Radio Help
Hello, I have a Philco (Ford) 6TPZ and a 5TPO radio.  I replaced the electrolytic capacitors in both.  I have the SAMS m...R3Sons — 12:29 PM
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

[-]
Who's Online
There are currently 7574 online users. [Complete List]
» 2 Member(s) | 7572 Guest(s)
AvatarAvatar

>