http://www.diyaudio.com/forums/const...ml#post1987690

Thanks.

Look what the mailman/woman dropped at my casa.

A matched quartet of GM70's (Almost ashamed at how little I paid for them) GM70's are for a SE GM70 amp with MQ parafeed iron.

And the 500R trimpots and 0,22uF caps for the Baby Huey.

A main reason I'm active on this project is the event coming up on the 5th. For me there's nothing like a deadline to get me out in the garage.

A lot left to do:

• MLS measurements - on/off axis at varying output impedances for 3 drivers will make for quite a few measurements
• Figure out how to enclose the mid - I'm thinking open back at the moment
• Design the active crossovers in Soundeasy
• Build the active XOs - point to point likely using FirstWatt B1 type buffers (two JFETs isn't much more work than an opamp)
• Paint

Two weeks left!

edit: applogies to anyone viewing this at less than 1280 screen width... It formats properly with that (two images side by side) but I'm not going to go and redo all the images now!!! I already did twice....

OK Continuing on where Part 1 left off. The next step was to attach the Power Supply wiring. I will continue the numbering from the first blog entry for consistency.

18. 19.

images 18 and 19 show the completed amplifier with +ve -ve and zero volts wires connected. Note also that there is a separate zero volts return from the zobel capacitor to the star ground on the PS board. The red wire is the +ve the blue wire the -ve and the green wire is the zero volts. The return for the speakers is direct from the speaker output jack to the star point on the PS board. So in all there...

edit: applogies to anyone viewing this at less than 1280 screen width... It formats properly with that (two images side by side) but I'm not going to go and redo all the images now!!! I already did twice....

Well I said about 4 years ago that I would do a build writeup for my P2P gainclone. I took all of the pictures but never got around to it. I'm off sick and lacking energy so decided it was as good a time as any to have a crack at it

I started out with the BrianGT schematic. I wanted to build something that people were using and was likely to just work. Here is a copy of the schematic

Note I did not use a volume pot or the mute switch) but all other components are as per the schematic (including optional ones).

First off some pictures of the chip itself.

1. ...

And while I was at it I saw some 0,22uF Epcos MKV from the same seller. The Epcos will do duty as coupling cap, as I've seen good reports (anecdotal) on them.

I asked Ian (gingertube) what the 470R resistors were for. Because I figured the CCS would take care of everything of the balance.

Here was his answer:
...

Fact: I work in construction and drive a lot - more than 50,000km per year. Fact: I live in Canada.
Canada is a nice place to live but...
We endure a temperate climate here with sometimes huge swings in temperature and precipitation. We get heat, we get cold, we get rain, we get snow, we get it all, sometimes (in some places) in one day!
Character building it's said to be, makes one rugged, tough...
Good stuff for a romance novel but I (of course) have a different view on it: the extremes of climate here don't make us hard wearing, but wear us out!
We are beaten down by the weather, submissive to it's eventuality. We talk about it in whinny, complainy tone - "it's too hot!", "It's too cold", "snow deep enough for ya?" It has made us meek.
Why? Because it owns us, we are it's bitch, as surely as most of you fellows would be if thrust into a prison situation...


Me, I used to love winter....

I have used a diy fluid for drilling for the first time. Used bicycle chain oil...water and detergent. Quite happy with it. Drilled the largest hole yet. And it looked almost professional.

Also a photo of the oak enclosure after it was treated with boiled linseed oil. The oil makes the oak enclosure look a lot better, it really brings out the grain. As usual I don't have "before" pictures to show the difference. (the pictures below had a partial coat already)

I'm not sure what to seal the wood with. Suggestions are welcome. Right now I'm thinking about shellac.

I just posted Circlotron Meditation #3: The All JFET Circlotron

i dont know if i am doing this right, but i need a potentiometer for a cyrus2 amp, and any metal casings for the toggle on/off switch variety including the psx.cyrus do not supply spares, having tried on numerous occasions, and getting nowhere. please help, there must be one out there somewhere. my email is scotchb@fsmail.net. awaiting reply in ernest. cheers.