that one rod elliott's referring to that comes close to providing proper heatsink to their amps

from here http://sound.westhost.com/articles/guitar-amps.htm

"Of all the brands, there is one US maker who seems to generally get most things more or less right. There have been some spectacular blunders with early valve amps and some of the re-issues, and the continued use of completely unshielded pickups and wiring inside many of their guitars is a constant source of irritation. However, they do seem to enjoy comparatively better overall reliability than many of the others, but there will still be exceptions. Many of their transistor amps are borderline IMO, but don't often fail - mainly because modern power transistors are extremely rugged and regularly outperform their datasheet maximum ratings and published safe operating area.

oh yeah, got it

accdg. to Rod Elliott "no heatsink is too big"

yeah, I do understand those two different grounds

wow, really big heatsink for the 3886
Guess I have to make some friends in the aluminum and glass supply industry here to have those for cheap

I'm in a country (Philippines) where our wall outlets only has the LIVE and the NEUTRAL conductors. So, obvious question is where does my amplifier's ground go?

If I want to avoid shock, should the ground just remain inside the chassis and NOT CONNECTED to the chassis?
Or should I find a way to bring that Ground Connections to Earth? Question is how?

Any suggestions that would not ELECTROCUTE me is appreciated  :cheesy:

PS: I was actually starting the build, but then that part crossed my mind.

I know this is very far from the original topic but i don't think a new thread is needed. I've seen dpst switches for the mains of the ps before it go to the traffo, is it better than an spst only in the hot wire?

i just found this out http://ph.rs-online.com/web/p/cartridge-fuses/5413546/
items are a bit pricey though, but for the free delivery, I can't complain

Oh I forgot, I'm from the Philippines
Not a great place to find parts if you're an electronics hobbyist

thanks Juan and DrGonz, I was a bit worried I won't get a reply here

I recently looked for a slow blow fuse from a local electronics store. I plan to use it for the mains part of the PS for an LM1875 power amp. Well, they don't stock it since it's not commonly purchased by people here. So, can I use a quick acting fuse instead? I bought the 5SF 1-R by BelFuse and plans to put it in the mains and the +/-rails of the amp.
Also, in Rod Elliot's Project 72, the switch comes before the fuse. My IEC Connector already has a fuse housing so can I do it the way where the fuse comes before the switch then?

I'm a little bit worried though since all I have are quick acting fuses.

Quote from: J M Fahey on March 16, 2016, 05:12:23 PM
So it looks like you have a suitable PT for 2 x LM1875 amp  :dbtu:

+1 ☺
Okay, now I can start building.
Oh wait, what size of wires should I use for the amp?
Can I use typical 22 gauge hookup wires with no shielding or is it very important to use shielded ones?

haha, I do realize that  :cheesy:

Okay, A is about 78 mm, B 64 mm, thickness is 35 mm

To J.M.:
I can't measure that iron stack. Is that the part where the wire is being wound? I can't seem to see it. My traffo is this one

Also, besides my 35A panel mount bridge rectifier, I do have some PCB mount bridge rectifiers rated at 4A and 6A. Can I use them instead? How should I know what rating of bridge rectifier to use?

To Bear:
I think both can be used for home amps. Refer to J.M. Fahey's reply above

Quote from: J M Fahey on March 15, 2016, 12:32:33 PM

As of powering it with 12+12V (I suppose DC) amp will work but it won't longer put out 20W RMS , think 5 or 10W depending on load, is that fine with you?

A very common 12+12VAC 1A transformer will give you raw 16+16V rails and around 15W power, not bad.

Add:

Quote from: J M Fahey on March 15, 2016, 12:32:33 PM
FWIW when somebody brings for repair an old Sansui/Technics/Yamaha/whetever old faithful amp and balk at the price, (hey!!! I paid $89.99 for it, NEW!!!! ... in 1989 ... ), they leave it.
I pull the transformer and sometimes the heatsinks, also the fancy knobs, and junk the rest, such transformers can always be used for projects similar to yours.
I build nothing with them, although might help me to replace a dead one, but donate them to enthusiastic Musicians who want to build "something".

I do love donations and I am an ENTHUSIASTIC MUSICIAN