Rooster in Tennessee on YouTube sells fatboy products. He should have a link in description. I believe he takes custom orders though I'm not certain. Such as add class B bias and SSB delay or preamp so on so forth.
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low output from this 4 pill
- Thread starter JimboSlice
- Start date
Whats with the 2k resistors in the feedback circuit? I'm not an amp builder, but I think those are usually around 100Ω.
Edit: Although obvious, it did start out as an 8 pill, its written on the metal by the green light. Perhaps someone intended to put 200Ω in the feedback and messed up putting the 2KΩ in there and one by one the pills started popping from oscillations eventually becoming a 4 pill as they popped???? Maybe only two good pills remain...
Edit: Although obvious, it did start out as an 8 pill, its written on the metal by the green light. Perhaps someone intended to put 200Ω in the feedback and messed up putting the 2KΩ in there and one by one the pills started popping from oscillations eventually becoming a 4 pill as they popped???? Maybe only two good pills remain...
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Shadetree Mechanic
Delaware Base Station 808
Here is a link to the amp plans thread. These were designed for the Toshiba transistors, so the input and output tuning will be different.
Post in thread 'free 1-16 pill amp plans' https://www.worldwidedx.com/threads/free-1-16-pill-amp-plans.33972/post-626943
Post in thread 'free 1-16 pill amp plans' https://www.worldwidedx.com/threads/free-1-16-pill-amp-plans.33972/post-626943
I'm going to test the input tune and output tune caps as well as the caps on the transformers, I saw in a bbi video that might be the problem. just ordered a pf meter if there bad I will replace them, The heatsink also got pretty hot so I'll use a temp gun on the pills to see if there getting hot from what I gather that's a sign of a bad pill?
Looks like the input is shorted thru the ground plane. I don't build amps but this doesn't look right, like they soldered both legs of the cap, center conductor and input transformer with a blob to the copper board.
When you say the input is shorted through are you talking about the shielding on the coax making connection with the center element of the coax in the solder joint just to the left of what you have. Only thing I’d be able to do is replace components like caps and resistors, I can’t tell you what value or resistance they need to be, but I can swap them out. Iv been watching amp building tutorials all weekend
No, and yes. It appears the center conductor is soldered to the copper board inside the blue circle, same copper board that the coax shield is soldered to outside the circle. They both appear to be soldered to the same copper plane. Could be the pic but it looks like a short.
Nice catch Cable Guy !
Everything in the blue circle should be floating and not grounded. Only thing that should be grounded is one leg of the cap and the shield to ground.
Attachments
Shadetree Mechanic
Delaware Base Station 808
Here is a thread from when I smoked my X Force four pill. I replaced the DEI transistors with HG and went down the rabbit hole with the tuning. Should be some information towards the end about the correct tuning values.
X-Force 600HD Smoked
Hey guys, I need some advice. I have been running my X-Force 600HD with my Stryker 955 for about a year now. The other day I was talking on it on side band and noticed the output power disappeared. I unkeyed real quick and went over to the amp shelf and smelled an electrical smell. I unplugged...
Thank you I really appreciate the explanation, this will be my first time touching one of these things, once my capacitor tester comes in the mail I’ll float that circuit, on one of the heat sink fins it almost looks like something arced out and melted the aluminum a bit, if this is the case is any of the components salvageable or would they all be toast
In this condition I would imagine the swr would be awful between the radio and amp. If it is truly shorted and not floating, I wouldn't tx into it.
The amp does look like doo doo, but you didn't ask for judgement, instead for help and aside from ugly welds and questionable practices reflecting the builder, I think it could work. I don't see any burnt resistors so that's good. Maybe it originally blew up, causing the arcing marks on the heatsink, then was rebuilt into a 4 pill. I get the feeling that those are different pills than originally installed. Ditto on the impedance matching issues spoken of by Shadetree Mechanic.
The amp does look like doo doo, but you didn't ask for judgement, instead for help and aside from ugly welds and questionable practices reflecting the builder, I think it could work. I don't see any burnt resistors so that's good. Maybe it originally blew up, causing the arcing marks on the heatsink, then was rebuilt into a 4 pill. I get the feeling that those are different pills than originally installed. Ditto on the impedance matching issues spoken of by Shadetree Mechanic.
Just pull the center conductor, orange wires and one leg of that cap out of the puddle and solder together.