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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Fri 15, 2017 12:12 am 
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Pbpix wrote:
john8750 wrote:
Here is a preview of the test speakers for the shop
Attachment:
ts.jpg

Notice, it is not the original Zenith speaker.

I'm sure they'll probably sound "alright" but John, how do you know what the acoustically-proper box size & shape should be for that particular speaker? Or did you just pick anything that physically fit the size? Do you know if it should be ported or not?

I am under the impression that speaker enclosures are specifically designed around each different speaker for optimal acoustical qualities.
If I were to try to make a speaker enclosure, I'd be concerned that if I made a box of any-old size that maybe I'd be reducing the qualities instead of improving it. Y'know?

So who here knows this stuff? Chime in.

Will you be using a grille cloth cover?



`
No calculations Peter. I figure there is more than enough cubes to have a fair sounding car speaker. The grill is just a stamped sheet of metal. Will be ok for the work area, and for testing. No serious rock-n-roll.
I will let you know how they sound.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Fri 15, 2017 12:52 am 
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john8750 wrote:
No calculations Peter. I figure there is more than enough cubes to have a fair sounding car speaker. The grill is just a stamped sheet of metal. Will be ok for the work area, and for testing. No serious rock-n-roll.
I will let you know how they sound.

Hi John:
What are "cubes"?

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Fri 15, 2017 2:28 am 
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Pbpix wrote:
john8750 wrote:
No calculations Peter. I figure there is more than enough cubes to have a fair sounding car speaker. The grill is just a stamped sheet of metal. Will be ok for the work area, and for testing. No serious rock-n-roll.
I will let you know how they sound.

Hi John:
What are "cubes"?




Come on Peter. That means cubic feets :wink:

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Fri 15, 2017 3:22 am 
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john8750 wrote:
Pbpix wrote:
john8750 wrote:
No calculations Peter. I figure there is more than enough cubes to have a fair sounding car speaker. The grill is just a stamped sheet of metal. Will be ok for the work area, and for testing. No serious rock-n-roll.
I will let you know how they sound.

Hi John:
What are "cubes"?




Come on Peter. That means cubic feets :wink:

It does? Ok.. so what does that mean "more than enough 'cubic feet' " ?

What do you mean? Where does many cubic feet of anything come into play here?
Not sure what you refer to.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Fri 15, 2017 3:48 am 
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He is referring to the internal volume of the box.

John, it isn't as simple as having an abundance of cubic feet.

Each speaker requires a certain box volume to work its best, although some speakers require an open back or ported box and to put either of those two in a sealed box may not work too well far as sound quality is concerned.

When building a box for a speaker it is best to build a box that has as much volume inside as the original speaker box has.


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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Fri 15, 2017 4:23 am 
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Tube Radio wrote:
He is referring to the internal volume of the box.

John, it isn't as simple as having an abundance of cubic feet.

Each speaker requires a certain box volume to work its best, although some speakers require an open back or ported box and to put either of those two in a sealed box may not work too well far as sound quality is concerned.

When building a box for a speaker it is best to build a box that has as much volume inside as the original speaker box has.



The speakers are for car use. There is no way I can get that much volume in a small box. I did not port them, but will have some sound insulation installed. I am sure they will give a very faithful reproduction of the sound, for testing. You will be the second person to know.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Fri 15, 2017 4:25 am 
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Yes... "more cubic feet" in a speaker box?
... yeah.. just a bigger box doesn't mean "works better"

Remember they have programs available where you enter your speaker info and it tells you the box dimensions.

http://www.bcae1.com/spboxnew2.htm

https://www.diyaudioandvideo.com/Calcul ... BoxVolume/

https://www.diyaudioandvideo.com/Calcul ... lume/Help/

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Fri 15, 2017 5:54 am 
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Pbpix wrote:
Yes... "more cubic feet" in a speaker box?
... yeah.. just a bigger box doesn't mean "works better"

Remember they have programs available where you enter your speaker info and it tells you the box dimensions.

http://www.bcae1.com/spboxnew2.htm

https://www.diyaudioandvideo.com/Calcul ... BoxVolume/

https://www.diyaudioandvideo.com/Calcul ... lume/Help/



They will be fine.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Fri 15, 2017 10:07 pm 
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Test speakers are complete, except the front grills. Will test them and the amps soon as I get finished with a few more circuit boards for the RR.
Attachment:
sspeakers.jpg
sspeakers.jpg [ 110.05 KiB | Viewed 1287 times ]

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Fri 15, 2017 11:44 pm 
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Tissue boxes for your ceiling? Cool.

Sneeze upwards.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sat 16, 2017 12:18 am 
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Pbpix wrote:
Tissue boxes for your ceiling? Cool.

Sneeze upwards.
:lol: :lol: I did a double take because, at first, it looked like maybe the pic was upside down.


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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sat 16, 2017 1:07 am 
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And no one even wanders what those hoses are?

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sat 16, 2017 2:48 am 
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john8750 wrote:
And no one even wanders what those hoses are?

"Wander" ?
No. My wandering days are over.
But I did wonder what they were and guessed A/C.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sat 16, 2017 4:20 am 
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Pbpix wrote:
john8750 wrote:
And no one even wanders what those hoses are?

"Wander" ?
No. My wandering days are over.
But I did wonder what they were and guessed A/C.



That's close enough Peter. They are for heat in the winter. Outside the wall there is a solar heat collector box.
I made it out of aluminum pop cans. Then pipe about a hundred cfm from two small 12volt fans. It works great,
but the sun must be out, even a little cloudy works some. The warm air pours out right on top of me.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sat 16, 2017 4:29 am 
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john8750 wrote:
Pbpix wrote:
john8750 wrote:
And no one even wanders what those hoses are?

"Wander" ?
No. My wandering days are over.
But I did wonder what they were and guessed A/C.



That's close enough Peter. They are for heat in the winter. Outside the wall there is a solar heat collector box.
I made it out of aluminum pop cans. Then pipe about a hundred cfm from two small 12volt fans. It works great,
but the sun must be out, even a little cloudy works some. The warm air pours out right on top of me.

If God was so smart he would have put the sun out at night when we really need it.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sat 16, 2017 10:27 pm 
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john8750 wrote:
Pbpix wrote:
Yes... "more cubic feet" in a speaker box?
... yeah.. just a bigger box doesn't mean "works better"

Remember they have programs available where you enter your speaker info and it tells you the box dimensions.


They will be fine.


Hi John:

"they will be fine" ?
Do you mean, I really don't care if they are designed exactly right or not because i just want to stick 'em in a box... and so, whatever they sound like will be "good enough" for my purposes in my shop?

Is that what you mean?

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sat 16, 2017 10:30 pm 
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john8750 wrote:
That's close enough Peter. They are for heat in the winter. Outside the wall there is a solar heat collector box.
I made it out of aluminum pop cans. Then pipe about a hundred cfm from two small 12volt fans. It works great,
but the sun must be out, even a little cloudy works some. The warm air pours out right on top of me.

Sounds clever John:
I didn't know it got cold in So. Calif.
What is the coldest you deal with?
Can you describe more about what you built with the pop cans?
Show a photo or sketch ?

Did you make all the can w/no top or bottom and strap them together somehow?
Can't picture it.

like this?
https://www.youtube.com/watch?v=PyVPNOUpOVg

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sun 17, 2017 4:33 am 
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Pbpix wrote:
john8750 wrote:
Pbpix wrote:
Yes... "more cubic feet" in a speaker box?
... yeah.. just a bigger box doesn't mean "works better"

Remember they have programs available where you enter your speaker info and it tells you the box dimensions.


They will be fine.


Hi John:

"they will be fine" ?
Do you mean, I really don't care if they are designed exactly right or not because i just want to stick 'em in a box... and so, whatever they sound like will be "good enough" for my purposes in my shop?

Is that what you mean?


Man Peter, you catch right on. Hi-fi, maybe not. Make a decent amp test speaker, probably.

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sun 17, 2017 4:47 am 
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Pbpix wrote:
john8750 wrote:
That's close enough Peter. They are for heat in the winter. Outside the wall there is a solar heat collector box.
I made it out of aluminum pop cans. Then pipe about a hundred cfm from two small 12volt fans. It works great,
but the sun must be out, even a little cloudy works some. The warm air pours out right on top of me.

Sounds clever John:
I didn't know it got cold in So. Calif.
What is the coldest you deal with?
Can you describe more about what you built with the pop cans?
Show a photo or sketch ?

Did you make all the can w/no top or bottom and strap them together somehow?
Can't picture it.

like this?
https://www.youtube.com/watch?v=PyVPNOUpOVg


Kinda like the one on the right. I have 8 rolls with 10 cans in each roll. 80 cans. The rolls are installed into a plenum
on the bottom, and a supply plenum on the top. The rolls are glued together, 1" holes are cut in the ends. This is to
slow down the air so it can be heated before being forced back into the shop to warm me up. The box is insulated
and chrome plenum tape in behind the cans to reflect the solar heat rays that are amplified through a Plexiglas
front panel. The cans are painted black to absorb the heat.
It can stay in the 40's in the winter, and lower.
This is identical to mine.

https://www.youtube.com/watch?v=G-nIGjQEtpA
Get the idea?

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 Post subject: Re: Philco amp re-build.
PostPosted: Sep Sun 17, 2017 10:31 pm 
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Here is a photo of the heater. Just ready for a re-sealing for the winter. The summer sun is brutal.


Attachments:
heater.jpg
heater.jpg [ 123.25 KiB | Viewed 1234 times ]

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