Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Probably something common like 2N3055.

Use the Silvertone part number and go to the NTE web site and look up their cross.  It may not be exact, but it will tell you what NTE thinks the part needs to be.

If the amp is working, I'd leave them alone.  Transistors don't wear out like tubes do.

I second this.  Also, if you provide us with pictures it may help.

Look through these posts:
https://www.ssguitar.com/index.php?topic=3022.0
https://www.ssguitar.com/index.php?topic=3686.0

Some schematics through the posts.

Good digging, thanks!

Back in March, EHX released the 15w Howitzer pedal amp.  The difference with this and the older 5mm, 22 Cal, and 44 Magnum, is this has a full preamp in front!  3 Band EQ, normal and bright modes, gain, and master volume.  It also has an effects loop if you want to add some reverb or other inline effects.  Nice little class-d amp with reasonable preamp in front.
 I think that from the clips I've heard it sounds great clean and with light overdrive.  When you crank it into saturation it leaves a little to be desired.  With a street price currently at about $140 USD, it's still hard to beat though!

https://www.youtube.com/watch?v=7Vi0jS-t6Tc

https://www.musicradar.com/news/boom-its-the-new-electro-harmonix-15watt-howitzer-pedal-amp

I've seen it done before where the speaker goes to a female 1/4" jack, the amp has a female 1/4" output jack, and then when using it as a combo you use a short 6" speaker cable to tie them together.  Want to power a different speaker?  Just unplug the speaker and plug a longer cable from the amp output into another cab.  Want to use the Bandit speaker (like you do) as a cab for another amp?  Just unplug both ends of the 6" speaker cable and plug a longer cable into the Bandit from the amp serving as a head.  Clean and simple.

Peavey has announced updates to it's Vypyr series of amplifiers.  Now they have more amp models, more effects, and a reworked semi-open cab to "improve volume and tone".  I'm not normally big on the "a billion options in one amp" units, but I have to say, I'd like to sit down and play with one of these.

Pricing is $179, $349, and $499 for the 20w X1, 40w X2, and 100w X3 respectively.

https://www.musicradar.com/news/peavey-vypyr-x-series

I really appreciate all the suggestions from everyone. I popped over to a local vintage guitar shop in town on the off chance that they would have a similar headphone jack as a spare part. They had something very similar to I bought it for $7. As it turns out, the switching inside the jack is identical to the original. Even though I rang out all the connections on the old one, and everything seemed to be working, I went ahead and wired up the new jack and installed it. It ended up working perfectly. I'm guessing that perhaps the contacts internally were corroded, which may have loaded the circuit more than expected but that is a wild guess. Either way, I'm happy to say that the new jack worked. 

Good job getting it fixed up!

Bogner has done it again, this time on a mini level.  The Ecstasy Mini is an absolute face melter.  Street price is $329 USD.

https://www.musicradar.com/news/bogner-mini-ecstasy

Plugging in mono 1/4" plug into stereo headphone jack expecting stereo plug?  That could cause shorts.