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Post by housetech on Feb 10, 2021 15:29:07 GMT -5
Not too long ago, we found a guy in California (L.A.?) that rebuilds old speakers. I can't remember his business name but found him using google. My friend was rebuilding a console shortwave, multiband radio that needed the speakers rebuilt. If I recall, the shipping cost more than what he charge to rebuild the cones.
Trying to find info on old equipment is near impossible on the net. The best info you'll find is from old guys who worked the business and they are getting fewer by the day. You may need to join vintage equipment chat rooms to find retired guys who can answer your questions.
I agree with DYohn & Keith, doubt very much the amp put out 100 watts- maybe the total operating wattage @ 5 watts amp output, guessing.
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Post by leonski on Feb 10, 2021 18:35:54 GMT -5
Your power 'Guess' is very reasonable.......
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Post by daveczski65 on Feb 15, 2021 17:34:57 GMT -5
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KeithL
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Post by KeithL on Feb 15, 2021 23:21:16 GMT -5
Assuming the various markings on the diagram are correct...
The amplifier uses a single 6BQ5 per channel...
The amplifier is single ended (since it uses a single output tube per channel)...
Which means probably around 3 - 5 watts of relatively clean output per channel...
(And maybe a bit more if you're willing to tolerate a lot of distortion.)
The diagram shows the secondary windings on the output transformers as 3.2 Ohms...
So it should work fine with either 4 Ohm or 8 Ohm speakers...
But you definitely want to go with the highest efficiency speaker driver you can find...
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DYohn
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Post by DYohn on Feb 16, 2021 10:26:23 GMT -5
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Post by daveczski65 on Feb 16, 2021 16:53:50 GMT -5
Yes that is what I got 8ohm 40w full range 92sen. Thanks guys for the help! |
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Post by leonski on Feb 17, 2021 2:45:24 GMT -5
Cost for the pair?
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Post by Percussionista on Feb 17, 2021 12:06:37 GMT -5
OK, here's a funny thought... would it be possible to install a full-range "in-ceiling" speaker, like Emo's Vaulta in your cabinet?
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KeithL
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Post by KeithL on Feb 17, 2021 12:29:14 GMT -5
Interesting idea... and that should work pretty well. OK, here's a funny thought... would it be possible to install a full-range "in-ceiling" speaker, like Emo's Vaulta in your cabinet? |
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DYohn
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Post by DYohn on Feb 17, 2021 14:24:35 GMT -5
Sensitivity might be a bit low depending on the sound levels desired, but I bet Vaulta speakers would sound good in a similar application.
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Post by daveczski65 on Feb 17, 2021 16:16:35 GMT -5
Assuming the various markings on the diagram are correct... The amplifier uses a single 6BQ5 per channel... The amplifier is single ended (since it uses a single output tube per channel)... Which means probably around 3 - 5 watts of relatively clean output per channel... (And maybe a bit more if you're willing to tolerate a lot of distortion.) The diagram shows the secondary windings on the output transformers as 3.2 Ohms... So it should work fine with either 4 Ohm or 8 Ohm speakers... But you definitely want to go with the highest efficiency speaker driver you can find... Any ideas on upgrade of any of the tubes? They are still the orig sylvania tubes from 60s |
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Post by daveczski65 on Feb 17, 2021 16:22:24 GMT -5
They were 38 ea on parts express |
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Post by leonski on Feb 17, 2021 16:47:23 GMT -5
They were 38 ea on parts express If you tire of the sound or just do NOT like how your new speakers perform, keep the FOSTEX in mind. They start about 3x or so more $$$$ but are highly regarded and have higher sensitivity.....Makes the most of a limited amount of power. |
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Post by daveczski65 on Feb 17, 2021 17:05:38 GMT -5
They were 38 ea on parts express If you tire of the sound or just do NOT like how your new speakers perform, keep the FOSTEX in mind. They start about 3x or so more $$$$ but are highly regarded and have higher sensitivity.....Makes the most of a limited amount of power. This is for my step daughter, if it was me I would have gotten a pair of tekton SET speakers and a dynaco vta120 amp! Or black ice f35..She just wants to play records and be able hear them,,lol,she does care about sound, But I will keep them in mind,,I did look into them,they are nice,,but to nice for her,,if you get my drift,,Thanks |
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KeithL
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Post by KeithL on Feb 17, 2021 18:05:13 GMT -5
You have quite limited power so your choice really depends on your needs...
A lot of speakers will play at reasonable levels with even a few watts... but they aren't going to rock the house... And higher efficiency speakers are going to cost more... And, especially if price is a limitation, you're going to be sacrificing sound quality if you want higher efficiency...
Here's something else to consider... You can't put a bigger speaker in the hole... But you can use a smaller driver (just cut a masonite "adapter plate" for it)... If you put a small driver in an "oversized cabinet" (basically with an unsealed back)... You will get better bass response at the expense of not being able to handle a lot of power... However, since you don't have much power anyway, that isn't a problem... So you might want to consider a nice high efficiency 4" driver or 5" driver...
(A smaller driver will work better as a full range driver because it will do better with high frequencies than a bigger heavier driver.)
I might consider something like this:
Incidentally.... If you want to see a lot of very good reviews of drivers and such... And check outt his page where he rates a lot of small (and low cost) small drivers...
(just note that his reviews go back several years so some of these may no longer be available)
If you tire of the sound or just do NOT like how your new speakers perform, keep the FOSTEX in mind. They start about 3x or so more $$$$ but are highly regarded and have higher sensitivity.....Makes the most of a limited amount of power. This is for my step daughter, if it was me I would have gotten a pair of tekton SET speakers and a dynaco vta120 amp! Or black ice f35..She just wants to play records and be able hear them,,lol,she does care about sound, But I will keep them in mind,,I did look into them,they are nice,,but to nice for her,,if you get my drift,,Thanks |
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Post by daveczski65 on Feb 17, 2021 18:11:49 GMT -5
You have quite limited power so your choice really depends on your needs...
A lot of speakers will play at reasonable levels with even a few watts... but they aren't going to rock the house... And higher efficiency speakers are going to cost more... And, especially if price is a limitation, you're going to be sacrificing sound quality if you want higher efficiency...
Here's something else to consider... You can't put a bigger speaker in the hole... But you can use a smaller driver (just cut a masonite "adapter plate" for it)... If you put a small driver in an "oversized cabinet" (basically with an unsealed back)... You will get better bass response at the expense of not being able to handle a lot of power... However, since you don't have much power anyway, that isn't a problem... So you might want to consider a nice high efficiency 4" driver or 5" driver...
(A smaller driver will work better as a full range driver because it will do better with high frequencies than a bigger heavier driver.)
I might consider something like this:
Incidentally.... If you want to see a lot of very good reviews of drivers and such... And check outt his page where he rates a lot of small (and low cost) small drivers...
(just note that his reviews go back several years so some of these may no longer be available)
This is for my step daughter, if it was me I would have gotten a pair of tekton SET speakers and a dynaco vta120 amp! Or black ice f35..She just wants to play records and be able hear them,,lol,she does care about sound, But I will keep them in mind,,I did look into them,they are nice,,but to nice for her,,if you get my drift,,Thanks Thank you Keith, you always make time for us here on the forums. Yea I looked at the vaults ceiling speaker idea too,I was looking at a 6.5 in speaker as some of there specs were better then the 8in, I like your idea,gonna try a couple different speakers and see what works in the big open space they sit in. Thanks again KeithL, your the man! |
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Post by daveczski65 on Feb 17, 2021 18:19:26 GMT -5
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Post by leonski on Feb 17, 2021 20:21:44 GMT -5
Bass Reflex or Transmission Line enclouse according to the video. That'll get you the most bass possible from the driver.
And the T-Line is a woodworkers 'dream project'.....
I'm going to go look 'em up at the PE site and find out about enclousre size / plans.....
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KeithL
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Post by KeithL on Feb 18, 2021 10:01:46 GMT -5
Yes, TL enclosures are a dream project or a nightmare... depending on how much you like woodworking... and big boxes.
Note that, with bass reflex enclosures, as long as you get the port size and length, and the cabinet volume, right - the rest is somewhat negotiable. (You're supposed to use the right stuffing density but it doesn't have to be precise.... and the shape of the box isn't all that critical.)
BUT, with TL enclosures, almost everything is critical... The size matters... The exact taper of the column the entire way matters... And the stuffing density matters... Many plans specify that the density of the stuffing varies as you move along the column... And that matters too... So, if you build one, you really should follow the plans exactly... (And they tend to be rather specific about the driver you use as well.)
Also bear in mind that a TL does not give you a massive increase in efficiency. A horn acts like a transformer, and more efficiently couples the driver to the air, so it improves the efficiency of an appropriate driver. (It converts high pressure over low area at the throat to lower pressure over a larger area as you progress along the horn.)
At best a TL manages to utilize 100% of the power coming off the back of the speaker... which only doubles its overall output. You get an increase in efficiency - but not nearly as much as you would with a properly-designed horn.
(And not that much more than you would with bass reflex.)
If you use a search engine like Google you will also find lots of independent designs for TL speakers.... (They attract DIY projects because they're a cool idea... but such a hassle to build that not many speaker companies will bother... )
Bass Reflex or Transmission Line enclouse according to the video. That'll get you the most bass possible from the driver. And the T-Line is a woodworkers 'dream project'..... I'm going to go look 'em up at the PE site and find out about enclousre size / plans..... |
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DYohn
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Post by DYohn on Feb 18, 2021 12:03:12 GMT -5
Keith's description of TL design is right on. If you are interested, here is perhaps the best on-line resource: www.quarter-wave.com/I own a set of those Dayton 6,5 inch full rangers. I was very disapointed in their performance. They might work as mid-woofs in a 3-way or car audio installation but they are not great as FR drivers. |
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