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 Post subject: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Sat 11, 2017 4:28 am 
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Location: shirley NY...Long Island
Thanks for the help if you do...I believe the "A" version is different than the standard 6515...

Kenny


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Sat 11, 2017 4:39 am 
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Location: Indianapolis, IN
PM an e-mail address and I'll send the SAMS PDF...

John


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Sat 11, 2017 8:51 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: SoCal, 91387
Kenny old boy, I have a Channel Master service manual for models from 6503 to 6517, and a list price bulletin for models 6500 to 6555.

Nowhere is there any mention of a 6515A. What John graciously sends you I am sure will be sufficient. :wink:

BTW, the manufacturers suggested list price for this model in 1964, was $44.95. The better part of a week's take home pay back then.

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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Sat 11, 2017 9:25 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Black Hills, SD 57745
Mine says 6515A on the label inside the rear cover. So the variation does exist, but I have no clue what was changed. Case color? In another 6515 thread by the op, the schematic and info I provided has matched mine when I needed to reference it. I sure didn't compare it trace by trace to my radio, so who knows?
-Ed


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Sat 11, 2017 11:00 pm 
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Location: shirley NY...Long Island
This is what it says in the inside back cover of my 6515A.


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Sat 11, 2017 11:05 pm 
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Joined: Dec Tue 08, 2015 12:53 am
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Location: shirley NY...Long Island
The output transistors in the diagram say, 2sb56 where in my radio they are 2sb187 which looking for a replacement they listed from the NTE's where two different numbers..

It seems I always find the most oddball F ing radios out here...

KNY


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Sat 11, 2017 11:49 pm 
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Location: Rayleigh, BC, CANADA
Not really oddball, My radio is a red 6515A as well

I have the same diagram with 2SB56 O/P transistors

the transistors in my radio are 2SB186, go figure, they all have different specs.

2SB56 - W:0.15 / MHZ:0.5 / HFE:30 / TO1

2SB186 - W:0.15 / MHZ:0.2 / HFE:160 / TO1

2SB187 - W:0.20 / MHZ:1.0 / HFE:100 / TO1

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Rocco


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Sun 12, 2017 1:04 am 
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Location: shirley NY...Long Island
Rocco53 I was talking about all the other radios...this CM is a very nice radio...as is my CM 6519...I was going to buy a 6506...buts I dont have the money....because of buying oddball ones...or lets say different ones...like the Allied...


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Sun 12, 2017 9:27 am 
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Location: SoCal, 91387
The print from CM also lists the AF Amp and Driver as 2SB54's and the outputs as 2SB56's. My black CM 6515's label lists the model as 6515A, so could be that all of them are labelled that way, maybe to ID the different Transistors used.

The audio Transistors inside are two Sanyo 2SB187's, one 2SB185, and one 2SB186. I'm guessing that they used a stock of equivalent Transistors with which they got a deal on, after the schematic had already been printed. I would think that these are too many substitutes for a normal production change.

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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Sun 12, 2017 8:49 pm 
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Joined: Dec Tue 08, 2015 12:53 am
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Location: shirley NY...Long Island
Check out the condition of this 6515


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Sun 12, 2017 9:01 pm 
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Location: Rayleigh, BC, CANADA
NICE!!! a black 6515 without the letter "A"

so....which O/P transistors does this one have?

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Rocco


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Mon 13, 2017 10:58 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2261
Location: Lakewood, California
I recently recapped one of my Channel Master radios, a Red 6515 (no letter”A”). It has the 2B56 output transistors, matching the Channel Master and Sams manuals.

Fifties is spot on concerning the price of a 6515. I was working for a TV shop in Abilene, Texas when the owner took on the Channel Master line of products. I had to have one of the 6515’s, but the price was too rich for me at the time, so I paid it off at $10 a week out of my pay. My “ex-“ wife at the time was furious that I would spend so much money on a “toy”.

One of the curious things I remember from that time was the Channel Master rep bragging about the high quality components used in their TV’s and Stereos. One of the things he pointed out was the Sprague “Black Beauty” capacitors-------

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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Tue 14, 2017 1:05 am 
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Joined: Dec Tue 08, 2015 12:53 am
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Location: shirley NY...Long Island
I will let ya know when I get it in...I just bought it...

Kenny


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Tue 14, 2017 2:10 am 
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Joined: Oct Mon 26, 2009 10:02 pm
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Location: Indianapolis, IN
I Like Meade's story !

Isn't the 6515 the first model with the "woven-look" gold anodized grille and 6515A the later version with the silver perforated grille ?

John


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Tue 14, 2017 2:17 am 
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Kennynva wrote:
I will let ya know when I get it in...I just bought it...

Kenny

Thanks Ken

from the photo, those transistors look to be the 2SB56 variety

I think they made some changes to the 6515A

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Rocco


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Thu 16, 2017 4:50 am 
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Joined: Dec Tue 08, 2015 12:53 am
Posts: 236
Location: shirley NY...Long Island
I just typed a half of page for this response...and I hit some stupid..a................ss........keys and the hole this went to some box's with google chrome doing something...and lost it all...

Anyway. A 6515A has two caps on the collectors side of both trans...i removed both of them and absolutely NOTHING happens...no sound difference nothing..I left the connections sticking out of the component side of the board, to try different caps...again NOTHING..i dont even know why they are there, does anyone know why???? They are NOT listed on the 6515 at all, it list just one between the collectors of the output trans..C23 I think.

There HAS to be a different diagram for the 6515A

I dont get it.


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Thu 16, 2017 5:03 am 
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Joined: Dec Tue 08, 2015 12:53 am
Posts: 236
Location: shirley NY...Long Island
John I believe you are right...gold grill is the 6515 and the 6515A I have is a silver grill with holes in it like you drilled them out, a straight hole like a drill bit did it..

KNY


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Fri 17, 2017 6:49 am 
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Joined: Dec Tue 08, 2015 12:53 am
Posts: 236
Location: shirley NY...Long Island
The diagram, IS different on the 6515A so I dont know what to do...the output trans are 2sb187 so if i want higher treble, or less bass I think I need to change the two green mylar caps...to a different spec............


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Sat 18, 2017 6:58 am 
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Joined: Aug Wed 24, 2011 4:35 am
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Location: Sunnyvale CA
Kennynva wrote:
The diagram, IS different on the 6515A so I dont know what to do...the output trans are 2sb187 so if i want higher treble, or less bass I think I need to change the two green mylar caps...to a different spec............


As in the other thread, I would strongly suggest modifying the audio signal right after the volume control, and not removing any of the capacitors in the output stage. You want a high-pass filter, so a smaller series capacitor (like experiment with replacing the 10 mfd coupling cap with something like a .05 mfd) or even adding an explicit first order filter with a break frequency around 1500 Hz.

Altering or removing the capacitors in the output stage isn't the way to go, those are there for good reasons (like making the amplifier stable).

Brett


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 Post subject: Re: In Dire need of a schematic for a Channel Master 6515A
PostPosted: Nov Sun 19, 2017 8:21 pm 
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Joined: Dec Tue 08, 2015 12:53 am
Posts: 236
Location: shirley NY...Long Island
Thanks Brett will do.....the two trans are 2sb56 in the radio I just got yesterday..or the black one in the photo above... so after all there does seem to be alot of changes in the A version. The antenna is different also...it only has one coil, while the 6515A has two...This radio was completly dead..just a click of the speaker when turned on...so replaced all the caps, as I do in all the CM line...and got it to work...

Is there a difference between the green mylar caps and the brown ceramic caps????

Top is the 6515A

KNY


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