C2 radio speaker

[Bob L.]

Re: C2 radio speaker

Dino....seems correct on the speaker......this is a early 66 built 09/65 (194376S101735)...lots of left over parts from 65....

[Gerald L.]

Re: C2 radio speaker

I would not think you have killed the output transistor with a 4 ohm speaker w/o choke. It would see higher resistance (impedance) than design likely. If original chokes had 1.5 ohms resistance on an original 10 ohm speaker then the measured resistance across the open speaker leads would be less than 1.5 ohms. So you were just putting maybe twice the resistance across the output transistor, reducing the current draw well below design. Not being a radio engineer I don't know what that means to fidelity but it can not be good.

All this is suggesting that these old radios must have correct speakers and chokes to play well.

Output transistor is easy to check, turn radio on, hear the POP, okay.

[Bob L.]

Re: C2 radio speaker

Mike seems that your 63 should use the same speaker as do the 64-67 according to LIC...section 12 part # 19A org. GM Style...$30 bucks.........you my want to give them a call....1-800-466-6367..... FYI: if a female answers (she reminds me of the soup ****) hang up & call again! Rich over there seems to to be the ace.......try the new speaker thing & see how it goes......seems you need a new speaker any how.........Bob

[Gerard F.]

Re: C2 radio speaker

Mike,

I had a 4 ohm sound shop speaker in my 67. When it was cold and you just turned it on, it would sound fine. However it would shortly warm up and then the volume would go very low.

Then one day after extended use, I would get nothing and I knew I had blown the transister.

Take a look at this post from the old archives:

https://www.ncrs.org/forum/archive19.cgi?review=148291

The Restorer Article they are talking about is a short article in the Summer 2004 Restorer, p39.

Hope this helps,

[Mike M.]

Re: C2 radio speaker

Jerry thanks I'll check it out. Mike

[Gerald L.]

Re: C2 radio speaker

I just bought a LIC $30 speaker with choke. Across the leads it measures 0.5 ohms. I am told that the original speaker was 10 ohms with a 1.5 ohm choke added in parallel, thus an original speaker should show just less than 1.5 ohms across the leads. I am assuming that the current LIC speaker will warm up the output transistor, not good in the long term.