Twister Amps (buyer beware)

[rabbiporkchop]

This guy thinks he knows how to build amplifiers...

Seems ok so far? It gets better..
Clean signal into amp...

Nasty carrier? WTF!!!!

Nasty splatter..

This has been a public service announcement...

 

[Robb]

lol!

 

[Tallman]

Some how I don't think is going to pass the 43 db suppression rule.
Even for a splatter box that's pretty poor.

 

[rabbiporkchop]

Some how I don't think is going to pass the 43 db suppression rule.
Even for a splatter box that's pretty poor.

Needless to say, it won't be getting any airtime, and will be getting junked.

 

[Tallman]

Needless to say, it won't be getting any airtime, and will be getting junked.

Can you tell if it biased as a class "C" push pull? You could bias the amp to class "AB" push pull add some filtering and it might just work for you, unless you just don't want to mess with it.

It should be named "Titty Twister".

 

[rabbiporkchop]

Can you tell if it biased as a class "C" push pull? You could bias the amp to class "AB" push pull add some filtering and it might just work for you, unless you just don't want to mess with it.

Not worth messing with.. biased class c which normally wouldn't be an issue.

 

[Tallman]

Not worth messing with.. biased class c which normally wouldn't be an issue.

If you are really talented with de-soldering techniques you have a stash of 2SC2879's.

 

[rabbiporkchop]

If you are really talented with de-soldering techniques you have a stash of 2SC2879's.

Not beta matched of course so pretty useless to me

 

[Tallman]

Not beta matched of course so pretty useless to me

There is an inexpensive transistor testor on ebay that will help you match them.

 

[rabbiporkchop]

There is an inexpensive transistor testor on ebay that will help you match them.

Not much money invested. Bought years ago when prices were low. I'm sure one of those keydown types will snatch it right up since talking on all 40 channels simultaneously seems to be the rage these days.

 

[RatsoW8]

Or you could do the radio world a favor and scavenge it for parts so no one ever uses that pig of an amp.

 

[rabbiporkchop]

Or you could do the radio world a favor and scavenge it for parts so no one ever uses that pig of an amp.

That's an awesome idea

 

[Crusher]

If you put feedback circuits on it, maybe get rid of coil/ inductor on input and put trimmers across all transformers and retune amp properly. I bet it will do better. Probably has 330 across input transformers when it should be closer to a 910pf or 1000pf. That would alleviate need for inductor. The output should be either 680pf or 1000pf. Depends on the mix of material he used for transformers. I have redone many like this. The biggest issue is they aren't tuned right and they become more like a spread spectrum transmitter. In my early days, I had a really cheap GPX alarm clock. 5-10pf too much or not enough meant bleeding over radio. lol didn't have a scope or other necessities back then. But it gave me an idea if it was a harmic turd or not. Also too many windings on splitters/ combiners. Need 5 @ most. Yes I have done a lot of these rebuilds.

 

[Crusher]

The 5-10pf part I was referring to the input circuit. The input plays a major part in these amps for both effiency and cleanliness of signal

 

[543_Dallas]

If you put feedback circuits on it, maybe get rid of coil/ inductor on input and put trimmers across all transformers and retune amp properly. I bet it will do better. Probably has 330 across input transformers when it should be closer to a 910pf or 1000pf. That would alleviate need for inductor. The output should be either 680pf or 1000pf. Depends on the mix of material he used for transformers. I have redone many like this. The biggest issue is they aren't tuned right and they become more like a spread spectrum transmitter. In my early days, I had a really cheap GPX alarm clock. 5-10pf too much or not enough meant bleeding over radio. lol didn't have a scope or other necessities back then. But it gave me an idea if it was a harmic turd or not. Also too many windings on splitters/ combiners. Need 5 @ most. Yes I have done a lot of these rebuilds.

Shhhhhh...Let him put a price on it first.