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Old 3rd June 2008, 12:50 AM   #1
mikje is offline mikje  United States
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Default Vintage tube amp speakers

I recently picked up a Packard Bell tube stereo, model 7TU12, and have a question about the speakers. They are each driven off a transformer. These are obviously the type of speaker that needs the transformer. If, however, I want to run some other speakers off this amp, do I need to use the transformers? I ran this amp/receiver up to make sure it works before I put any money into it, and it really sounds nice with the speakers that came with it. But I'd still like to try some other speakers too, just for the fun of it. Thanks for any help you can offer!
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Old 3rd June 2008, 01:35 AM   #2
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It sounds like a field coil and if so those "transformers" on the back of the speaker is also the filter for the power supply of the amplifier section.
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Old 3rd June 2008, 01:43 AM   #3
mikje is offline mikje  United States
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Thanks for the reply. The transformers are on the amp. From what you're saying, it sounds as though I'll need to use them for any speaker I hook up. Is that correct?
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Old 3rd June 2008, 01:51 AM   #4
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Yup, you need those transformers.
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Old 3rd June 2008, 01:14 PM   #5
sreten is online now sreten  United Kingdom
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Default Re: Vintage tube amp speakers

Quote:
Originally posted by mikje
These are obviously the type of speaker that needs the transformer.
Hi,

A valve amplifier that has output transformers needs them to drive
any normal speaker. Its the amplifier that needs the transformers.

/sreten.
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Old 3rd June 2008, 02:28 PM   #6
mikje is offline mikje  United States
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sreten,
Thanks for the reply. The next question would be polarity. Both terminals on each of the transistors are the same and none are marked to indicate any polarity. Am I correct to assume polarity is not an issue?
Thanks again.
Mike
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Old 3rd June 2008, 04:18 PM   #7
sreten is online now sreten  United Kingdom
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Quote:
Originally posted by mikje
Am I correct to assume polarity is not an issue?
Thanks again.
Mike
Hi,

Absolute polarity is a unlikely issue. The 2 channels must be in phase,
so the relative polarity of the two connected speakers does matter.

/sreten.
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Old 3rd June 2008, 04:29 PM   #8
mikje is offline mikje  United States
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Do you know how I can tell which is positive and which is negative? Thanks!!!
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Old 3rd June 2008, 05:02 PM   #9
sreten is online now sreten  United Kingdom
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Hi,

Place the speakers facing each other. Reverse one speaker connection.
If you get lots more bass it is correct. If you get lots less bass then it
was correct and reverse the connections back again.

/sreten.

P.S. Positive and negative are a moot point for AC on a transformer,
however The "negative" will be directly connected to earth and the
"positive" will not be, it will have the feedback connection. Should
be able to work this out by inspection, e.g. the "negatives" may
be joined to each other whilst the "positives" cannot be.
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