Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on November 28, 2012, 07:43:57 am

Title: Are this small transformers usable for a shifting vibrato unit ?
Post by: kagliostro on November 28, 2012, 07:43:57 am

I recovered 5 pulse transformers like this from a tube military telephone equipment

Firstly I've think they are of no use for our purposes

Than I remembered the shifting vibrato unit build by Sluckey

There is a way to test if they are suitable ?

EDIT: does someone knows what mean the labeled data

on primary 132 T. - secondary 79 T. - tertiary 58 T. ? Mean Turns ?

Thanks

K

Title: Re: Are this small transformers usable for a shifting vibrato unit ?
Post by: kagliostro on November 28, 2012, 04:44:12 pm

No, I don't think they can be used that way :sad2:

All started because I was remembering badly the name of the kind of transformer

I remembered pulse transformer instead of saturating transformer

(http://www.el34world.com/Forum/index.php?action=dlattach;topic=10681.0;attach=20668;image)

http://www.el34world.com/Forum/index.php?topic=10681.0 (http://www.el34world.com/Forum/index.php?topic=10681.0)

However if someone knows if there is an use that can be done of those transformers he is welcome .........

Thanks

K

Title: Re: Are this small transformers usable for a shifting vibrato unit ?
Post by: HotBluePlates on November 29, 2012, 07:01:45 pm

Quote from: kagliostro on November 28, 2012, 07:43:57 am

EDIT: does someone knows what mean the labeled data

on primary 132 T. - secondary 79 T. - tertiary 58 T. ? Mean Turns ?

Yes, the "T" means Turns.

Impedances are not given directly, but you can figure the turns ratio between any two windings and calculate the impedance ratio.

Unfortunately, I don't really know whether they can be used in place of a saturable reactor, but my guess is no. Saturable reactors are very specialized devices.

Title: Re: Are this small transformers usable for a shifting vibrato unit ?
Post by: kagliostro on November 30, 2012, 07:10:50 pm

Thanks HBP

This small transformers is to be added to the pile of non usable I recovered from other military equipment :smiley:

K

Title: Re: Are this small transformers usable for a shifting vibrato unit ?
Post by: sluckey on November 30, 2012, 07:24:52 pm

Here's an example of the type circuit that pulse transformer might be used in. Your transformer would be used in a smaller blocking oscillator circuit than this, but the operation would be similar. I really can't think of any audio applications.

Title: Re: Are this small transformers usable for a shifting vibrato unit ?
Post by: HotBluePlates on November 30, 2012, 07:41:06 pm

Quote from: sluckey on November 30, 2012, 07:24:52 pm

... Your transformer would be used in a smaller blocking oscillator circuit than this, but the operation would be similar. I really can't think of any audio applications.

Translation: the oscillator works at frequencies way above the audio range, so you won't be building a trem oscillator with it.

Title: Re: Are this small transformers usable for a shifting vibrato unit ?
Post by: kagliostro on December 01, 2012, 01:55:44 am

Many Thanks Sluckey & HotBluePlates

Now, at least, I know what it is, which is no small thing !

K