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Old 31st August 2007, 12:43 PM   #1
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Default Other uses for 70v line transformers?

I have some 150w Altec Lansing 70v transformers with 8 ohm and 4 ohm taps. I have no use for them as 70v transformers, can anything else useful be done with them?
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Old 1st September 2007, 12:29 AM   #2
OzMikeH is offline OzMikeH  Australia
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Do you own a small boat?

Perhaps there is a door in your house that keeps blowing shut.

what is the impedance of the secondary? you might be able to use it backwards for a tube amp output transformer.

Use the primary as a power supply choke?
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Old 1st September 2007, 05:27 AM   #3
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As illustrated by some of the Bottlehead amps, 70V transformers can be used as output transformers in a parafeed SE amp.

dave
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Old 1st September 2007, 09:28 AM   #4
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Quote:
Originally posted by OzMikeH


Use the primary as a power supply choke?

I think all of these are autoxfmers but yes one could use as a choke with limited success. There is no core gap.

Dave mentioned parafeed output xfmer. I was going to mention that myself. I`ll add possible cathode coupler to load or way of tapping low-Z output stage cathode FB somewhere else, perhaps in series with the output xfmer speaker connections? Run the earth side of the output xfmer speaker winding to the cathode xfmer partial tap instead of to chassis ground. This ought to be the same as using an output xfmer that actually contains a real cathode FB winding.
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Old 1st September 2007, 10:20 AM   #5
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Did somebody say Tubes?

I think I'll just put them in the trading post.
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Old 1st September 2007, 01:37 PM   #6
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Did somebody say Tubes?

I think I'll just put them in the trading post.
Tubes yes. You can run, but you can`t hide.
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Old 1st September 2007, 03:06 PM   #7
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Default Never!

I've never heard nor seen(in person) a tube amp, and I intend to keep it that way.

I started out my HiFi life with Class-D and there is no other choice of amplification in my eyes. I won't be so close minded to say tubes s**k because I have no reference for that opinion. I don't intend to find out though.

Thanks, but respectfully no thanks.
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Old 1st September 2007, 05:47 PM   #8
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Default Re: Never!

Quote:
Originally posted by theAnonymous1
I've never heard nor seen(in person) a tube amp, and I intend to keep it that way.

I started out my HiFi life with Class-D and there is no other choice of amplification in my eyes. I won't be so close minded to say tubes s**k because I have no reference for that opinion. I don't intend to find out though.

Thanks, but respectfully no thanks.

Hmmmm. Well tubes only suck if you break the evacuation stem. I can remember when getting a -D in Class was not considered praisworthy.

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Old 1st September 2007, 06:17 PM   #9
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I have used 100V line transformers in a back to back tube preamp power supply. I drive them off 6.3V winding and then have two of the line transformers in series to make a center tapped power transformer. Good for about 150V filtered DC.

Shoog
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Old 1st September 2007, 06:20 PM   #10
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Default Re: Never!

Quote:
Originally posted by theAnonymous1
.......................I started out my HiFi life with Class-D ................

There are some who would say this was a contradiction !!!!!!!!!!!!

Andy
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