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

Another 610 schematic question
#1

Working on another 610 and I need to get my mind straight.

The chassis is wired similar to the later model, but with a few exceptions. Thought I'd touch base on 3 items first.

First, there is no phono switch. So can I assume the top of the volume pot connects between 31 (51K resistor) and 32 (the lower 110 mmf cap)?

Second, the existing chassis has the cathode of the 78 tied to ground (looks like factory wiring).Where should it really go?

And last, on the existing chassis, the cathode of the 6A7 goes through a 20Ω resistor to ground. Neither schematic shows that.

Got more, but Ithought I'd try these out first.

Pat

[Image: https://i.imgur.com/xnCAN3q.jpg]

[Image: https://i.imgur.com/NdRdTAS.jpg]
#2

Your chassis would seem to be an interim production between the two schematics. This isn't unusual.

1) You are correct.

2) In the late production, the cathode of the 78 goes to ground through the phono switch. The original had it connected to a network. I suspect that somewhere in between they modified it to go to ground.

3) As the 6A7 cathode is going to ground through a 300 ohm resistor while late production goes directly. As with the other modifications, this was most likely an interim change while the engineering department was tweaking the performance specs.
#3

Thanks Brenda Ann. I'll make those changes and see if there is anything else.
#4

Hello Pat ,
Yes I don't remember what production model of 610 mine is.
But they sure great sound little set and looks great after refinishing it to mine is the 610B




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 91 Speaker Replacement
I can't remember, but there was a particular product for loosening glue on the more modern "spiders", used pos...MrFixr55 — 09:43 PM
Philco 91 Speaker Replacement
The spider is glued on the cone and so is the voice coil. I think you can use a cotton swab dipped in acetone and carefu...RodB — 02:42 PM
Restoring Philco 37-604C
Yes I saw that. If I knew, I'd probably try to arrange for getting it myself. But I have just got one. Which does not m...morzh — 01:44 PM
Philco 38-2 Automatic Tuning
When you push the lever, you are supposed to rotate the disk to the desired station. Then the magnetic tuning will acqu...morzh — 01:42 PM
Philco 38-2 Automatic Tuning
I figure out the muting from another picture that helped. Now I need to know how the automatic tuning works. When I push...dconant — 12:11 PM
Philco 91 Speaker Replacement
How would I go about removing the spider from the cone?dconant — 12:04 PM
Philco 38-2 Automatic Tuning
Hello, I am having trouble getting my automatic tuning to stay unmuted. If I play with the tuning handle I can get it to...dconant — 10:51 AM
Does anyone make photofinish replacements?
Here’s the link to the DIY photofinish section of our site: klondike98 — 09:46 AM
Delco car radio Peko vibrator converstion issues
Hi Richard, Thx for posting the schematic.  As I remember as a kid, these were great performers for the time, likely...MrFixr55 — 08:56 AM
Delco car radio Peko vibrator converstion issues
hello mr Fixr, The Electro  Powersupply that I am powering the radio with has a huge choke plus a 10,000ufd electrolyti...radiorich — 10:58 PM

[-]
Who's Online
There are currently 1923 online users. [Complete List]
» 3 Member(s) | 1920 Guest(s)
AvatarAvatarAvatar

>