Ampmaker P1800

robinbowes

Fatfingers said:

I once bought a power scaling kit from that grumpy bloke in Canada. It's till sitting in the bag it came in, thanks to the hopeless 'instructions.'

Which one is that? And do you still want it?

R.

Fatfingers

Kevin Whatisname at London Power. I'm not sure of the name of the kit though. I'll try ad dig it out later as I'd happily sell it one.

martinw

Fatfingers said:

Kevin Whatisname at London Power. I'm not sure of the name of the kit though. I'll try ad dig it out later as I'd happily sell it one.

O'Connor, and yes he can be a bit abrupt!

The instructions he supplies require a bit of interpretation, and he'll often point you at his books for further information.

Fatfingers

Abrupt. Yes. At the very least. And as for buying one of his books; I may well have been m,ore open to that were it not for the, er, abruptness and the poorly written instructions. They didn't exactly fill me with confidence in his communication abilities. 

Anyway - it's a London Power Super Budget PSK 2 power scaling kit. I bought it in 2009, according to the invoice.

thermionic

I built an N5X just under a year ago. As it's very much a Marshall-inspired amp I got a nice 18W style cab built for it and put a Greenback in it. Lovely. Then I bought a gold script Marshall logo to finish it off. Thing is now, the cab is more Marshall than the amp and I think it deserves a proper Marshall circuit put in it... I hope to build a P1800 in the next six months!

Fatfingers

My Se5 is in a 1x12 cab with a Greenback too. I suspect it will be made obsolete by the P1800 though. I'm hoping it will be good for home use and the occasional pub gig.

Fatfingers

Grabbed a couple of hours and built the power supply section. Tested and working.

Fatfingers

Just got another half a day on it. Turret board fully populated.

Preamp and phase inverter wired up.

robinbowes

Fatfingers said:

Abrupt. Yes. At the very least. And as for buying one of his books; I may well have been m,ore open to that were it not for the, er, abruptness and the poorly written instructions. They didn't exactly fill me with confidence in his communication abilities. 

Anyway - it's a London Power Super Budget PSK 2 power scaling kit. I bought it in 2009, according to the invoice.

I'll PM you..

R.

samzadgan

looking good.

 

also that selmer head!...  =D>

ThePrettyDamned

Looks very tidy, I'm interested to hear clips of this, a friend might buy one but wants me to build it and test it!

Which is a frightening prospect, but would be a nice experience for me

Fatfingers

He needs to be a good friend. It's reasonably straightforward, thanks to the excellent instructions, but it's still time consuming. I reckon I'll have spent two good days on it - and that's without mounting it in a box.

ThePrettyDamned

Fatfingers;446904" said:

He needs to be a good friend. It's reasonably straightforward, thanks to the excellent instructions, but it's still time consuming. I reckon I'll have spent two good days on it - and that's without mounting it in a box.

Sod that.

Not to mention any risks of faults and stuff - different if it's my own amp.

I do want to do one, I might try the wee little tweed one.

Rocker

Go for it @ThePrettyDamned.  I can assure you that building a valve amp is one of the most satisfying DIY jobs you can do.  And the fact that you can use it for years, often casually letting it out that you built it yourself, is a bonus.  That moment you first hear your work 'speak' is one you will never forget.

And you built it yourself.

Fatfingers

I'll second that. My SE5 gave me years of pleasure. I'm sure this one will be even better.

Fatfingers

Volume, Bass and Treble controls wired up.

Fatfingers

Well, I've finished the chassis.

It works fine on the normal input but I couldn't get my head around the wiring for the two inputs and the big gain input is clearly not cutting out properly – other than when a jack is plugged into the normal in. The high gain one works - and is obviously higher gain, but it squeals like a pig. I'm guessing I've goofed up the input socket wiring somehow and that both inputs are live when you plug into the hot input, instead of the other one being grounded. I've emailed BArry at Ampmaker a pic of my wiring so he cam tell me how I've buggered it up.

MtB

Ha, snap. This is the exact same thing that happened to me on my build. I eventually worked it out, but I fed pack to Barry that I felt that this particular point was where you need photos rather than a diagram.

I have photos of the wiring of the inputs on mine. PM me with your email address if you want me to sent some photos.

Misterg

Looking good...

On the input wiring, I **think** you have the bare wire link between the two sockets backwards (difficult to make out from the photo)

http://i255.photobucket.com/albums/hh143/werdnayarg/webstuf/untitled_zps17956eb9.jpg

Compare with this from Barry's site:

http://www.ampmaker.com/images/ak03kit/p18wg11.jpg

The link should cross 3 tags near the panel and then strike diagonally to one of the tags on the rear. It **looks** like yours does the opposite.

(Double check R6 (the resistor on the furthest jack socket) is 1M - it doesn't look like brown black green in the photo, but this could well be just the photo.)

Fatfingers

Thanks for the help - much appreciated. That's the diagram I can't get my head round. I held the sockets every which way but couldn't see how they related to that diagram.

Here's what I've done. I'm sure you're right that I've screwed it up. I just can't make out exactly how.

(They're both 1M resistors. You just can't easily see them.)