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 41-608 changer coupler
3D-printing...short of machining, of course. Or molding.morzh — 05:20 PM
Philco 41-608 changer coupler
Thanks, Morzh. That solves the issue of the rubber pieces. Now, I need to find a way to replicate the pot metal piec...alangard — 05:07 PM
12' Philco
If it is 12', either Kareem or Andre would have to jump pretty high to look at the front panel. Kareem would have an e...morzh — 01:48 PM
12' Philco
And here's a story about the tires on the truck. Same "no-stoop" guy must have installed these! Take care a...GarySP — 01:17 PM
Hickok AC51 tube tester
I think they have only shown the secondaries of the transformer. Two of them feed the rectifiers' filaments.morzh — 12:58 PM
IF can wire size and Rubber mounts?
Arran If the wire inside cans is the gauges you mentioned, the sole reason for that would be mechanical, to stiffen t...morzh — 12:56 PM
12' Philco
Rod, Yes, I know, but the Giant Philco is not around anymore either, so I go by whoever was alive fairly recently. H...morzh — 12:54 PM
Hickok AC51 tube tester
Absolutely no one is going to reverse engineer that circuit. Even the iron core is missing.RodB — 10:37 AM
IF can wire size and Rubber mounts?
Thanks to both members for your help regarding wire and tuner mtg supports. regards--Johngeorgetownjohn — 09:33 AM
Hickok AC51 tube tester
Note that no power cord, power switch, or power transformer switch are shown. That (along with my experience with full s...DaleHCook — 07:09 AM

[-]
Who's Online
There are currently no members online.

>