I built the Playmaster 117 for a classmate in 1969. It made a lot of noise -- brought the woman next door out to complain when we tested in it the garage.

http://www.ozvalveamps.org/playmaster/116playmaster3gg.jpg

(Co-incidentally, he went on to be an in-demand session and band guitarist.)

That's an awful shame about poor Judith Durham, lovely lady with a lovely voice, I remember she suffered a stroke some time ago, but

hadn't heard anything since . You could still make guitar amplifiers! I play guitar and have a handwired Jim Marshall 100w Plexi Reissue,

one of the last ones made in England and it is the bomb, but I'd love to make a small amp for practicing and small gigs, around 15 odd watts

using type 42 output valves, but I just don't know where to start, if I had a circuit I could wire it up point to point using one of my junk radio

chassis's and new caps and resistors, I've got one or two mains transformers which would do...

You could still make guitar amplifiers!

I could do lots of things if I had another two lifetimes. My to-do list runs to 4 pages already!

I'd love to make a small amp for practicing and small gigs, around 15 odd watts ... but I just don't know where to start

You don't need 15 watts for practice unless you want to annoy everyone. Here's a cheap easy-build plain vanilla 3 watter made from easy to get parts. Of course, you'll need a 240 volt power transformer, but the average junk box should come up with a suitable one:

https://www.youtube.com/watch?v=E6CckyWY55g

However, if you're determined to have 10 watts or more, with all of the knobs, then there's this one:

https://www.youtube.com/watch?v=mgxiqx9A_NU

That's pretty cool GTC, the reason I was wanting around 15 watts, is probably my favourite amp I ever had was a Fender Pro Junior 15 watt

amp with a 10" Celestion speaker. I used to call it the "mouse that roars" because with an overdrive pedal turned up to between half and

three quarter volume I could just turn towards it and get ample sustaining feedback and do the Jimi Hendrix thing! People would laugh when I

brought it into a gig and be totally gobsmacked once we got cooking! But about one quarter volume tops and no pedal it was a decent

practice amp so extremely versatile. I like the sound of electrostatic speakers though, that warm full sound the console radio's have and think

it would be good for guitar, because with a Danelectro, Boss or Tube Screamer overdrive pedal it would blow the cobwebs out of a hall no

problem. I suppose a 6V6 amp could be subbed with 42's as they are electronically evolved from these. Believe it or not the Marshall Plexi

100w with 3x 12AX7's and 4x 6L6's makes a good practise amp as well as stadium blaster, you just jump the channels and just carefully

bring the B (treble) channel up around one tenth, basically to set the room volume and then bring the A (bass) channel up a tad to warm

up the sound, then use an overdrive pedal to make distortion if you want it, but cut the volume back to a mere sniff. The Marshall being a

slave amp is just incredibly clean! My main reason is that it'd be so cool to say "I made that"!!!

My son and I (aided by grandson) built this great kit amp.

https://www.tubedepot.com/products/classic-british-18w-tube-guitar-amp-kit-1x12-combo

It's a Marshall clone.....