Skipper 300

[Tweetybird]

I have a skipper that squeals when key watts normal at first then climbs to 900 watts putting 4 watts in about 10 seconds after keying squeals right away any ideas

 

[Tallman]

Bad parasitic filters

 

[Tweetybird]

Bad parasitic filters

I ordered a tube conversion schematic I hope it's on there I dont know what a parasitic filter looks like is it on the output part by the tubes? I'm new to this had electronics in high school 45 years ago thank you for responding

 

[Tallman]

The parasitic chokes/filters are resistors with wires wound around them. Look at some pictures of old tube amps they are in line with the B+ line going to the tube.

 

[Tweetybird]

The parasitic chokes/filters are resistors with wires wound around them. Look at some pictures of old tube amps they are in line with the B+ line going to the tube.

 

[Tweetybird]

The one I think is bad is the one before the driver tube on inlet it has a crack it's not the wire wound one in the center of the three power ones itsthe one on back nob

 

[Shadetree Mechanic]

It might be good if you can take a picture of it and post it here so we can be sure that we are all talking about the same thing.

 

[Tweetybird]

The parasitic chokes/filters are resistors with wires wound around them. Look at some pictures of old tube amps they are in line with the B+ line going to the tube.

I bought two watt 47 ohm axial resistors is the red band end the plus end?

 

[Tallman]

Resistors do not have a polarity like Diodes Or Electrolytic Capacitors.

 

[Tweetybird]

The parasitic chokes/filters are resistors with wires wound around them. Look at some pictures of old tube amps they are in line with the B+ line going to the tube.

The wires coils dont just bypass the resistor? There is an old linear on ebay with like 8 tubes it had pictures! I am trying to grasp the coil bypass does the resistor absorb the oscillations as they pass by it?

 

[Shadetree Mechanic]

Time to do some reading.
https://www.electronics-tutorials.ws/inductor/inductor.html

 

[Tallman]

The wires coils dont just bypass the resistor? There is an old linear on ebay with like 8 tubes it had pictures! I am trying to grasp the coil bypass does the resistor absorb the oscillations as they pass by it?

The resistor and the coil "Swamp" out some of the parasitic oscillations and keeps the B+ clean for the other tubes. Do not underestimate a few turns of wire in RF Circuits.
Read the article that Shadetree Mechanic and some of the mystery's will be answered, Or even more questions formulated.

 

[Tweetybird]

The resistor and the coil "Swamp" out some of the parasitic oscillations and keeps the B+ clean for the other tubes. Do not underestimate a few turns of wire in RF Circuits.
Read the article that Shadetree Mechanic and some of the mystery's will be answered, Or even more questions formulated.

Ok I made six one for each tube I will read shadetreesarticle thank you again

 

[Tweetybird]

Ok I made six one for each tube I will read shadetreesarticle thank you again

Still trying the picture thing and I got a sickness I bought another skipper this morning I couldn't help myself

 

[Tweetybird]

Still trying the picture thing and I got a sickness I bought another skipper this morning I couldn't help myself

To post pictures I cant explain my purchase of broken amps to fix them I guess but now I'm am at the what's wrong how to fix part