It Might Get Loud!

[jeremy]

look forward to you firing it up! build looks great. about how much time you think you have into it so far? just curious since ive never done anything close to that complex

 

[JMP/HBE]

Original Hiwatts with Partridge transformers put 500+vdc on the screens which no current made EL-34 can sustain. Not sure if that pertains to your amp.

 

[ThreeChordWonder]

Original Hiwatts with Partridge transformers put 500+vdc on the screens which no current made EL-34 can sustain. Not sure if that pertains to your amp.

Doubt it... the spec says 467 volts.

 

[ThreeChordWonder]

look forward to you firing it up! build looks great. about how much time you think you have into it so far? just curious since ive never done anything close to that complex

I reckon about 40 hours plus thinking time, so say 80.

 

[Mincer]

So what's the first tune you are going to play?

 

[JMP/HBE]

So what's the first tune you are going to play?

.

 

[ThreeChordWonder]

So what's the first tune you are going to play?

Knowing my luck Smoke on the Water...

 

[ThreeChordWonder]

Knowing my luck Smoke on the Water...

As I was saying...



That brown thing used to be a 470 ohm 10 watt resistor...

 

[Mincer]

How does that happen? Honestly, I have no idea.

 

[ThreeChordWonder]

How does that happen? Honestly, I have no idea.

Obviously drawing too much current. How that happened TCW ​​​​ has no idea..

Hopefully one of the tube amp wizards on the Marshall forum will.

 

[jeremy]

ooof! yeah, somethings outta whack there. take anything else out with it?

 

[JMP/HBE]

Id rather pay someone to take the zap for me ...

 

[ThreeChordWonder]

ooof! yeah, somethings outta whack there. take anything else out with it?

Just the 100 ohm ceramic immediately upstream.

Both have been replaced now, and I ran the amp up to full power, but with the EL34s removed and the common feed from the 470 ohm burnt offering to the EL34 grids disconnected. All good so far.

I think it's probably a short (or shorts) on the EL34 sockets. New sockets arrive tomorrow.

I'm practicing safe electrical protocol. The common or black wire to the multimeter has an alligator clip on it, clamped to the chassis, and I'm probing VERY carefully using the red (hot) probe one handed.

 

[ThreeChordWonder]

Gentlemen, I am pleased to annouce:


https://youtu.be/0VkrUG3OrPc


A bit of tinkering to do and I'm going to give everything a blast of deoxit or something, but....


https://youtu.be/0VkrUG3OrPc


And bloody loud too!

 

[ThreeChordWonder]

I love the glow of tubes at twighlight....

 

[Gtrjunior]

Clips!!!
Clips!!!!

I’ve been dying to give building an amp a go.

 

[jeremy]

sweet! hell, it even looks loud

 

[Mincer]

Is it heavy? Are you gonna build a cabinet? I was just listening to sweet HiWatt tones on King Crimson's Red.

 

[ThreeChordWonder]

Is it heavy? Are you gonna build a cabinet? I was just listening to sweet HiWatt tones on King Crimson's Red.

Cabinet should be here Monday.

If you buy a kit from Stewmac it will come complete with the cabinet. If you buy from Mojotone you can buy the kit, get it working, then buy the cabinet separately.

 

[JMP/HBE]

Just the 100 ohm ceramic immediately upstream.

Both have been replaced now, and I ran the amp up to full power, but with the EL34s removed and the common feed from the 470 ohm burnt offering to the EL34 grids disconnected. All good so far.

I think it's probably a short (or shorts) on the EL34 sockets. New sockets arrive tomorrow.

I'm practicing safe electrical protocol. The common or black wire to the multimeter has an alligator clip on it, clamped to the chassis, and I'm probing VERY carefully using the red (hot) probe one handed.

#22
"07-05-2023, 11:25 AM
Original Hiwatts with Partridge transformers put 500+vdc on the screens which no current made EL-34 can sustain. Not sure if that pertains to your amp."