This is yet another antique radio to bluetooth speaker conversion. My dad passed away recently. He has a collection of old electronics that included an old Philco radio. The insides aren't salvageable, alas, so it's a candidate for conversion. I've got a few questions regarding the build (which will be my first speaker build ever).
The interior dimensions are roughly 13.5 x 7.5 x 8". It's got a single 5.5" oval opening in the front. I'm planning to build a cabinet that will go inside of the radio body, and to go mono rather than stereo. Here are my questions:
The interior dimensions are roughly 13.5 x 7.5 x 8". It's got a single 5.5" oval opening in the front. I'm planning to build a cabinet that will go inside of the radio body, and to go mono rather than stereo. Here are my questions:
- Given the cabinet size, would you go with a single full range speaker or a combination of speakers?
- Based on your answer to #1, what bluetooth amp board would you recommend?
- I've just learned about the existence and purpose of passive radiators. If going with multiple speakers rather than a single full range, does each speaker get its own isolated space in the cabinet and its own PR or can one PR work with multiple speakers in the same cabinet?
- I'd like to keep the original knobs that were on the radio and in their original locations, but of course their purposes will change. Of course one will be volume, but if you were me, what would you do with the others? Treble & bass? Crossover frequency & bass volume? Something else? (I have 4 knobs total)
There's a fiber mesh that goes behind the oval opening in the front, and of course there's a vented back that I've removed. I still have the internals, though it looks like some of the tubes are burned out.
Kind of looks like an oval car radio speaker might fit inside. Note exactly enough space to develop serious bass. Maybe that and some damping material. However damping material might not be good for heat flow of active electronics. Besides, looks like it would have to be mono. What would you do with stereo sources?
Yeah - definitely planning to go mono. What sold me was the realization that lots of small bookshelf speakers (like Sonos) are mono but they still sound great. I'm assuming that if I get a mono bluetooth amp it will automatically mix stereo music to mono.
Well, if you ( manage to) preserve the original Power amp, that would be half (1/3) of the work, although I would always change and old speaker for a more performing One.
The same goes for all the parts of a system, so my First sentence Is not-true.
But, well, tubes...nobody has a tube BT!
The idea of making a sub enclosure Is good: every function must be separated...
The same goes for all the parts of a system, so my First sentence Is not-true.
But, well, tubes...nobody has a tube BT!
The idea of making a sub enclosure Is good: every function must be separated...
The functions are skip/previous, volume up/down, source select and sby/on
depends what the final choice of amplifier is. for push buttons likely could find pots with dual function with rotary and button.
also power on/off switch on one as well.
might be possible still get stereo with side by side drivers that fit in current cutout.
even passive radiators on back for bass.
also power on/off switch on one as well.
might be possible still get stereo with side by side drivers that fit in current cutout.
even passive radiators on back for bass.
A pair of Tectonic TEBM65C20F-8 3-1/2" BMR Full-Range Speaker
might go ok for this application, they need about 2ltrs each of volume
Maybe squeeze in a subwoofer if you used a pair of the TEBM46C20N-4B 3"(recommended .3ltr)
might go ok for this application, they need about 2ltrs each of volume
Maybe squeeze in a subwoofer if you used a pair of the TEBM46C20N-4B 3"(recommended .3ltr)
Not recommending for this application, however...
https://www.aiyima.com/products/aiy...al-amp-w-vu-meter-100w?variant=39530049732683
Cannon,
It's almost perfect for the job (I think it has DAC and BT capabilities built into it. And tubes!). But unfortunately, it's almost perfect (you will have to dismantle the whole amp and retrofit the boards, tubes and plugs...not to mention the PSU).
K.
It's almost perfect for the job (I think it has DAC and BT capabilities built into it. And tubes!). But unfortunately, it's almost perfect (you will have to dismantle the whole amp and retrofit the boards, tubes and plugs...not to mention the PSU).
K.
Cool looking radio!
I have used another, higher powered version of this ;https://www.ebay.com/itm/363928497873?_trkparms=amclksrc=ITM&aid=1110006&algo=HOMESPLICE.SIM&ao=1&asc=250309&meid=fe3a0d59f1234477aa831113700063ca&pid=101429&rk=2&rkt=12&sd=175366460293&itm=363928497873&pmt=1&noa=0&pg=2332490&algv=SimplAMLv5PairwiseWebDomesticOnly&brand=Unbranded&_trksid=p2332490.c101429.m2460&amdata=cksum:363928497873fe3a0d59f1234477aa831113700063ca|enc:AQAIAAABAO2qPy6hqkRlDST6EDhej1ks97DhixehT1sR7yO7TlEW6b7ds8UdThZ4Ey8r6s6BdOSLmeZtEUDI6piEjbBIsi1sMTymrQA7jZkBe3PcTCOF5%2BzleeLjylN1JRxpRfmyMyVIsn8nvJthlrCwNSIT%2FbXhdDvT0rfXWKkunqyZeH1PWNpkvYt8y4n%2FxyhkPdKb9fEQDQnK1F8iXMG17jJW%2FIJ8t8Es6o5UrE9WH4Pbljee9bWnMyrPsaApszu6RbyU9zcsnwhR%2FIMi%2Bu92ONuUGG0OGLSt3WekVZ4X%2FZmPNjoJu5Lrp4YWnX6TX5212Okm2FhfNdqfAK7stE1G%2FCthJFo%3D|ampid😛L_CLK|clp:2332490
It enabled some bookshelf speakers to be used hands free. A small 12-19v power supply would be perfect, and would also fit inside that case.
Being a stereo board, it would require two speakers or at the least, a load resistor in place of an unused channel.
My choice would probably be a pair of 3 1/2” automotive speakers and some closed cell foam behind them if not fully enclosed.
I have used another, higher powered version of this ;https://www.ebay.com/itm/363928497873?_trkparms=amclksrc=ITM&aid=1110006&algo=HOMESPLICE.SIM&ao=1&asc=250309&meid=fe3a0d59f1234477aa831113700063ca&pid=101429&rk=2&rkt=12&sd=175366460293&itm=363928497873&pmt=1&noa=0&pg=2332490&algv=SimplAMLv5PairwiseWebDomesticOnly&brand=Unbranded&_trksid=p2332490.c101429.m2460&amdata=cksum:363928497873fe3a0d59f1234477aa831113700063ca|enc:AQAIAAABAO2qPy6hqkRlDST6EDhej1ks97DhixehT1sR7yO7TlEW6b7ds8UdThZ4Ey8r6s6BdOSLmeZtEUDI6piEjbBIsi1sMTymrQA7jZkBe3PcTCOF5%2BzleeLjylN1JRxpRfmyMyVIsn8nvJthlrCwNSIT%2FbXhdDvT0rfXWKkunqyZeH1PWNpkvYt8y4n%2FxyhkPdKb9fEQDQnK1F8iXMG17jJW%2FIJ8t8Es6o5UrE9WH4Pbljee9bWnMyrPsaApszu6RbyU9zcsnwhR%2FIMi%2Bu92ONuUGG0OGLSt3WekVZ4X%2FZmPNjoJu5Lrp4YWnX6TX5212Okm2FhfNdqfAK7stE1G%2FCthJFo%3D|ampid😛L_CLK|clp:2332490
It enabled some bookshelf speakers to be used hands free. A small 12-19v power supply would be perfect, and would also fit inside that case.
Being a stereo board, it would require two speakers or at the least, a load resistor in place of an unused channel.
My choice would probably be a pair of 3 1/2” automotive speakers and some closed cell foam behind them if not fully enclosed.
Based on the size constraints, would you go three way mono and put a PR (or a port) on the sub enclosure, or go two way with a tweeter+full range with a PR (or port) on the full range?
https://www.madisoundspeakerstore.com/approx-3-fullrange/sb-acoustics-sb10pgc21-4-3-full-range/
I would put two of these 3" FR next to each other behind the opening (not ideal but ok) and keep it stereo for more choices of amps/preamps. And get bass from somewhere else...
I would put two of these 3" FR next to each other behind the opening (not ideal but ok) and keep it stereo for more choices of amps/preamps. And get bass from somewhere else...
The oval hole Is stamped and the grill needs full area to house more than a speaker, so It needs to be substituted.
Or the back becomes the new baffle but still I'm baffled...I mean, multiway stereo speakers & Company Is a serious game
Or the back becomes the new baffle but still I'm baffled...I mean, multiway stereo speakers & Company Is a serious game
