Audio transformer as amp

[timmy]

Ok so I have a pilot tv and it's known that they don't have loud audio so I was thinking of using another audio trans to have louder audio by taking the output of the trans that's there for the speaker already and placing the output wires to the primary of a second trans and the secondary wires to the speaker. Does this sound like it would work, at least it seems it would but not sure.

[init4fun]

Originally Posted by timmy

Ok so I have a pilot tv and it's known that they don't have loud audio so I was thinking of using another audio trans to have louder audio by taking the output of the trans that's there for the speaker already and placing the output wires to the primary of a second trans and the secondary wires to the speaker. Does this sound like it would work, at least it seems it would but not sure.

No Timmy , it wouldn't work for several reasons , the biggest being the mismatch of the differences in the secondary windings of your existing transformer and the primary windings of the transformer you want to add .

Remember , transformers transform power , they do not amplify it , and in the transformation process , there are losses as no device is 100% efficient in transforming power .

[timmy]

Well I just thought the secondary windings of the first trans would act like a preamp into the primary of the second therefor make the sound louder.

[N2IXK]

In order to amplify a signal, you need an external source of power.

A transformer can increase either voltage or current (at the expense of the other), but output power will ALWAYS be less than you put in because of losses in the transformer. Using one transformer to feed another will INCREASE the transformer losses, and add even more loss due to impedance mismatch.

If you want more audio output power, you need a more powerful output stage, or an external amplifier.

[miniman82]

It's a 3" CRT, how far away can you get from it that the audio doesn't reach your ear drum while still being able to see what's on?

[timmy]

yes i know,lol,lol but heres another question, the green 3kp1 crt is not bright at all so is there a way to increase the brightness, i think it takes voltage to dim it and take voltage away to brighten, maybe the other way around.

[Kamakiri]

The 3KP1 in my Pilot is plenty bright. And no.....the sound won't bust an eardrum but I can hear it across the room. Your set must have issues because for what it is....I'm pretty pleased with the performance.

[rca2000]

it MIGHT..be possible...to boost the output of the audio amp already there..by upping the B+ volts to the B+ supply for it... to 200 or so ..using a doubler or such or an external cold power supply for it. BUT..that would require a LOT or ckt. changes...and I am NOT sure it would work out well at ALL...for the rest of the set !!

[timmy]

Originally Posted by Kamakiri

The 3KP1 in my Pilot is plenty bright. And no.....the sound won't bust an eardrum but I can hear it across the room. Your set must have issues because for what it is....I'm pretty pleased with the performance.

Well the sound is really not a big issue and I can here it across the room but it's really not as bright as it should be and I still have not come up with a way to check hv, maybe that's why it's not bright along with the other crt I have.

[miniman82]

Have you done an IF alignment on it? If it's not aligned properly, sound will definitely be down in level when clear correctly tuned video is on screen.

[timmy]

Sound is really ok I just got used to other sets that were louder so if that's the way they are it's fine. It's just now the hv I'm looking into because I have 2 very good crts and its dim so something is up with that.

[miniman82]

Scope tubes in my experience have never been as bright as a magnetically deflected CRT, probably just the way it is.