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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sun 17, 2017 10:34 pm 
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john8750 wrote:
Here is a photo of the heater. Just ready for a re-sealing for the winter. The summer sun is brutal.

The youtube video shows the black-screen version puts out more heat than the tin-can version by about 5 degrees... and simpler to build.
https://www.youtube.com/watch?v=PyVPNOUpOVg

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sun 17, 2017 10:44 pm 
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Pbpix wrote:
john8750 wrote:
Here is a photo of the heater. Just ready for a re-sealing for the winter. The summer sun is brutal.

The youtube video shows the black-screen version puts out more heat than the tin-can version by about 5 degrees... and simpler to build.
https://www.youtube.com/watch?v=PyVPNOUpOVg




He did not build the heater properly. Look at the can heater. He has no solar reflector behind the cans, and no sealed plenum, return and supply. my heater has run at 183F. How long did he run his?

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sun 17, 2017 10:50 pm 
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john8750 wrote:
Pbpix wrote:
john8750 wrote:
Here is a photo of the heater. Just ready for a re-sealing for the winter. The summer sun is brutal.

The youtube video shows the black-screen version puts out more heat than the tin-can version by about 5 degrees... and simpler to build.
https://www.youtube.com/watch?v=PyVPNOUpOVg




He did not build the heater properly. Look at the can heater. He has no solar reflector behind the cans, and no sealed plenum, return and supply. my heater has run at 183F. How long did he run his?

Hey... don't beat me up.... lol .... I just showed you the video... lol

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sun 17, 2017 11:07 pm 
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Location: Los Angeles
Its show time boys and boys.
I cleaned off my work bench. Then connected both Philco amps to the test speakers.
Plugged them in. The first amp works good. The second amp did not work at all.
Swapped speakers, same, swapped all tubes, same.
AC voltages were close enough on the input, and up to the preamp tube.
I checked all connections, good. OT connections. Coupling caps, good.
Then did a signal check from the preamp tube forward, found the problem.
C6, .047 coupling cap. Pin5 of the preamp tube, 6AU6 had a small bouncing AC
signal. Input to the 6AQ5, pin1 had no signal. Bad cap?
Then I decided to check the resistance of the grid leak, R8, 470K.
Read 470ohms! I had installed the wrong size resistor.
So I replaced it and, that made the thing work.
They both work pretty good.
And, the test speakers are totally acceptable, good bass and treble control,
although they only cut and cannot boost, still do work.
I could enjoy listening to these while working at the bench.
I know you wont believe me Peter, so just get on the train and come out
here to hear them yourself. we'll leave the light on for ya :lol:


Attachments:
philco amps.jpg
philco amps.jpg [ 69.88 KiB | Viewed 1402 times ]

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sun 17, 2017 11:13 pm 
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This is me and my Cousin. I was about 5 or so.
BTW- I am the boy.
Who would of thought that he would turn out to be a Genius?
Attachment:
09.jpg
09.jpg [ 194.56 KiB | Viewed 1401 times ]

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sun 17, 2017 11:20 pm 
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john8750 wrote:
This is me and my Cousin. I was about 5 or so.
BTW- I am the boy.
Who would of thought that he would turn out to be a Genius?
Attachment:
09.jpg

i thought you were the liitle blonde and maybe still transitioning with all the sex change operations.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sun 17, 2017 11:24 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 23894
Location: Haledon, NJ, usa
john8750 wrote:
Its show time boys and boys.
I cleaned off my work bench. Then connected both Philco amps to the test speakers.
Plugged them in. The first amp works good. The second amp did not work at all.
Swapped speakers, same, swapped all tubes, same.
AC voltages were close enough on the input, and up to the preamp tube.
I checked all connections, good. OT connections. Coupling caps, good.
Then did a signal check from the preamp tube forward, found the problem.
C6, .047 coupling cap. Pin5 of the preamp tube, 6AU6 had a small bouncing AC
signal. Input to the 6AQ5, pin1 had no signal. Bad cap?
Then I decided to check the resistance of the grid leak, R8, 470K.
Read 470ohms! I had installed the wrong size resistor.
So I replaced it and, that made the thing work.
They both work pretty good.
And, the test speakers are totally acceptable, good bass and treble control,
although they only cut and cannot boost, still do work.
I could enjoy listening to these while working at the bench.
I know you wont believe me Peter, so just get on the train and come out
here to hear them yourself. we'll leave the light on for ya :lol:

Hi John:
Looking good.
Very glad these little gifts are in your hands where you are having fun using them instead of still sitting in a box on my repair shelf.
Good on ya!

I thought you said you were going to check EVERY resistor on your new component testing thingie?
This is why I suggested to mark your resistor storage envelopes with the correct colors too so as to avoid making these mistakes.
I had the SAME problem with these 1% 4-band lousy color code resistors.

As for the dual amp inputs... if it were me.. I'd want to combine the inputs to one single vol control and such.

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To be a man, Be a non-conformist, Nothing's sacred as the integrity of your own mind.
-Emerson


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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sun 17, 2017 11:44 pm 
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Joined: Dec Mon 29, 2014 9:39 pm
Posts: 5159
Location: Los Angeles
Pbpix wrote:
john8750 wrote:
Its show time boys and boys.
I cleaned off my work bench. Then connected both Philco amps to the test speakers.
Plugged them in. The first amp works good. The second amp did not work at all.
Swapped speakers, same, swapped all tubes, same.
AC voltages were close enough on the input, and up to the preamp tube.
I checked all connections, good. OT connections. Coupling caps, good.
Then did a signal check from the preamp tube forward, found the problem.
C6, .047 coupling cap. Pin5 of the preamp tube, 6AU6 had a small bouncing AC
signal. Input to the 6AQ5, pin1 had no signal. Bad cap?
Then I decided to check the resistance of the grid leak, R8, 470K.
Read 470ohms! I had installed the wrong size resistor.
So I replaced it and, that made the thing work.
They both work pretty good.
And, the test speakers are totally acceptable, good bass and treble control,
although they only cut and cannot boost, still do work.
I could enjoy listening to these while working at the bench.
I know you wont believe me Peter, so just get on the train and come out
here to hear them yourself. we'll leave the light on for ya :lol:

Hi John:
Looking good.
Very glad these little gifts are in your hands where you are having fun using them instead of still sitting in a box on my repair shelf.
Good on ya!

I thought you said you were going to check EVERY resistor on your new component testing thingie?
This is why I suggested to mark your resistor storage envelopes with the correct colors too so as to avoid making these mistakes.
I had the SAME problem with these 1% 4-band lousy color code resistors.

As for the dual amp inputs... if it were me.. I'd want to combine the inputs to one single vol control and such.



Thanks again Peter. Oh what a thrill it is to have them.
I had already bought and received resistors for these amps separately. My meter is auto ranging, I don't like it for this reason. In the top right corner of the display, is a very small designating emblem to show either an ohm, K, or M. So using my old eyes, I saw the wrong emblem.
And there is no way I can figure out those 4 or 5 band resistors. You need squinty eyes for that.
You know how I like vintage stuff. Just wouldn't be the same if I remodeled for one volume control.

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If I did something right, I made a mistake.


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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Mon 18, 2017 12:21 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 23894
Location: Haledon, NJ, usa
john8750 wrote:
Pbpix wrote:
john8750 wrote:
Its show time boys and boys.
I cleaned off my work bench. Then connected both Philco amps to the test speakers.
Plugged them in. The first amp works good. The second amp did not work at all.
Swapped speakers, same, swapped all tubes, same.
AC voltages were close enough on the input, and up to the preamp tube.
I checked all connections, good. OT connections. Coupling caps, good.
Then did a signal check from the preamp tube forward, found the problem.
C6, .047 coupling cap. Pin5 of the preamp tube, 6AU6 had a small bouncing AC
signal. Input to the 6AQ5, pin1 had no signal. Bad cap?
Then I decided to check the resistance of the grid leak, R8, 470K.
Read 470ohms! I had installed the wrong size resistor.
So I replaced it and, that made the thing work.
They both work pretty good.
And, the test speakers are totally acceptable, good bass and treble control,
although they only cut and cannot boost, still do work.
I could enjoy listening to these while working at the bench.
I know you wont believe me Peter, so just get on the train and come out
here to hear them yourself. we'll leave the light on for ya :lol:

Hi John:
Looking good.
Very glad these little gifts are in your hands where you are having fun using them instead of still sitting in a box on my repair shelf.
Good on ya!

I thought you said you were going to check EVERY resistor on your new component testing thingie?
This is why I suggested to mark your resistor storage envelopes with the correct colors too so as to avoid making these mistakes.
I had the SAME problem with these 1% 4-band lousy color code resistors.

As for the dual amp inputs... if it were me.. I'd want to combine the inputs to one single vol control and such.



Thanks again Peter. Oh what a thrill it is to have them.
I had already bought and received resistors for these amps separately. My meter is auto ranging, I don't like it for this reason. In the top right corner of the display, is a very small designating emblem to show either an ohm, K, or M. So using my old eyes, I saw the wrong emblem.
And there is no way I can figure out those 4 or 5 band resistors. You need squinty eyes for that.
You know how I like vintage stuff. Just wouldn't be the same if I remodeled for one volume control.

Hi vintage John:
Well if you think about.. these amps were never designed as a stereo-amp the way you are using them They came out of old mono-phonographs or such from the 50s or 60s I think.
So since you're sort-of modifying the original idea anyway... you could just add a little outboard vol control and wire it over to each input preset-cranked up to max. But if you don't mind trying to get each channel vol balanced... enjoy them as is.
Have fun buddy. Thanks for giving them new life.

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To be a man, Be a non-conformist, Nothing's sacred as the integrity of your own mind.
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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Mon 18, 2017 3:58 am 
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Joined: Dec Mon 29, 2014 9:39 pm
Posts: 5159
Location: Los Angeles
And thank you peter. A few times now you have helped me greatly.
Now to mount both amps on a nice frame and set it on top of the Zenith.
It will be used for my listening pleasures while in the shop.
BTW- the amps must of had a low level input, like a crystal stylus.
The MP3 has plenty of volume.

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If I did something right, I made a mistake.


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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Mon 18, 2017 5:54 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 23894
Location: Haledon, NJ, usa
john8750 wrote:
And thank you peter. A few times now you have helped me greatly.
Now to mount both amps on a nice frame and set it on top of the Zenith.
It will be used for my listening pleasures while in the shop.
BTW- the amps must of had a low level input, like a crystal stylus.
The MP3 has plenty of volume.

But now you have downward facing music... will this depress you?

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To be a man, Be a non-conformist, Nothing's sacred as the integrity of your own mind.
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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Mon 18, 2017 7:33 am 
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Joined: Dec Mon 29, 2014 9:39 pm
Posts: 5159
Location: Los Angeles
Pbpix wrote:
john8750 wrote:
And thank you peter. A few times now you have helped me greatly.
Now to mount both amps on a nice frame and set it on top of the Zenith.
It will be used for my listening pleasures while in the shop.
BTW- the amps must of had a low level input, like a crystal stylus.
The MP3 has plenty of volume.

But now you have downward facing music... will this depress you?




I had wondered how that would sound. Seems to sound good. Different though.
Why would that depress me?
The tone controls are both responsive, and work good. I am impressed with the amps and speakers.
They seem to be a good match. Next will be to try the amps with the Zenith.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Mon 18, 2017 9:17 am 
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Posts: 23894
Location: Haledon, NJ, usa
john8750 wrote:
Why would that depress me?

Sound is pressing downward upon your hillbilly brain.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Mon 18, 2017 5:13 pm 
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Does it sound good enough to where the bass channel is not needed?


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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Mon 18, 2017 7:30 pm 
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Joined: Dec Mon 29, 2014 9:39 pm
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Location: Los Angeles
Pbpix wrote:
john8750 wrote:
Why would that depress me?

Sound is pressing downward upon your hillbilly brain.




My brain was shot long ago. At about seven, on my grampas farm in New Mexico. He had a bull.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Mon 18, 2017 7:36 pm 
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Tube Radio wrote:
Does it sound good enough to where the bass channel is not needed?



Yes, it has plenty of bass now. Can tell better after connection to the Zenith.
When I tested the first amp, it was connected to a speaker just laying on the bench,
no enclosure. Now the speakers are enclosed with some padding in the back.
Sounds very good.
Much appreciate your work. Would like to see that Magnavox subwoofer amp schematic.
Unless it is the same one I already have.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Mon 18, 2017 8:45 pm 
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It's the Motorola schematic.

I still have it.

I'll look today and see if it is completed and if so I'll email it to you.


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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Mon 18, 2017 8:53 pm 
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Tube Radio wrote:
It's the Motorola schematic.

I still have it.

I'll look today and see if it is completed and if so I'll email it to you.



Thanks Justin. I have it somewhere also. But to find it :?:

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Mon 18, 2017 8:59 pm 
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You're welcome.


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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Mon 18, 2017 9:04 pm 
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Tube Radio wrote:
You're welcome.



I found it. From Motorola, it must be good....

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