Bought Altec Lancing and Sugden Monoblocks Â£100

Paul Barker · Post by **Paul Barker** » Wed May 28, 2014 11:47 am

The main capacitor bank looks alright to me.

Is that transformer big enough

jack · Post by **jack** » Wed May 28, 2014 11:48 am

I love old solid state amps - great find (dates from 1969). I got a Perreaux 2150B in a similar way from a friend who was about to bin it...

A bit of major re-capping will probably be required - good fun!

Hope the enclosed are useful (if you don't have them, or better, already)

Paul Barker · Post by **Paul Barker** » Wed May 28, 2014 11:52 am

I think he bought one

Loved it, and saved up for another:

Oddly the one with more ageing going by looks is the more recent one built by June. But there is so little in it.

Paul Barker · Post by **Paul Barker** » Wed May 28, 2014 11:59 am

Great Nick.

Output impedance 0.2 ohm in series with 10,000 µF

somebody please tell me I am not listening to a capacitor coupled output stage to the tune of 10,000 µF electrolytic.

Please please NO! it's so wrong!

Paul Barker · Post by **Paul Barker** » Wed May 28, 2014 12:01 pm

I wander if there is an equivalent Schotky? And how much?

Paul Barker · Post by **Paul Barker** » Wed May 28, 2014 12:03 pm

your guess is as good as mine. The little circuit on the side.

answers on a postcard?

looking at the rest those blue caps look quality and in good condition.

Those brown resistors? I am sure they are Allen Bradbury's.

In which case, they are sorted, as long as they are in tolerance today, those are great sounding resistors.

Anyway I know from the sound I hear this Sugden feller was not about making a reasonably good sound out of as cheap a component as he could source like so many, and hiding their cheapness with feedback.

No you don't buy transformers that big in 1968 for a cheap hoodwink the masses project.

pre65 · Post by **pre65** » Wed May 28, 2014 12:04 pm

What is the number on the diode ?

jack · Post by **jack** » Wed May 28, 2014 12:06 pm

pre65 wrote:What is the number on the diode ?

Its a 1N5401 (100V, 3A) - at least it should be.

Just noticed that the component list I had doesn't quite match the schematic (though its close). I suspect the component list may be for a later update...

Paul Barker wrote:your guess is as good as mine. The little circuit on the side.

answers on a postcard?

That looks like the input buffer from the left hand end of the schematic - the give-away is the screened coax connections...

Paul Barker · Post by **Paul Barker** » Wed May 28, 2014 12:13 pm

nickds1 wrote:
pre65 wrote:What is the number on the diode ?
Its a 1N5401 (100V, 3A) - at least it should be.

Just noticed that the component list I had doesn't quite match the schematic (though its close). I suspect the component list may be for a later update...

1N5401 another number on it 7645

Must admit the one on the right next to the Alen Bradly looks scary darkened.

So Max RMS voltage 70 Max PRV 100v 3a Schottky anyone? Without having to sell my PX4's to purchase?

Paul Barker · Post by **Paul Barker** » Wed May 28, 2014 12:19 pm

OK not used to this.

What about 10 of SB100 5A Schottky for £5 London source on eBay?

Would need two packs.

pre65 · Post by **pre65** » Wed May 28, 2014 12:22 pm

All I've got are BY255 1300v 3A but not Shottky.

jack · Post by **jack** » Wed May 28, 2014 12:22 pm

Paul Barker wrote:1N5401 another number on it 7645

1976, 45th week - its a date code.

Why not just replace them with ... 1N5401s? They're very cheap...

Paul Barker · Post by **Paul Barker** » Wed May 28, 2014 12:23 pm

nickds1 wrote: That looks like the input buffer from the left hand end of the schematic - the give-away is the screened coax connections...

Oh, so I could build me a Voltage follower?

Can't believe it sounds so good without a single valve. my world is upside down.

Shall i build a CF buffer instead?

Paul Barker · Post by **Paul Barker** » Wed May 28, 2014 12:27 pm

nickds1 wrote:
Paul Barker wrote:1N5401 another number on it 7645
1976, 45th week - its a date code.

Why not just replace them with ... 1N5401s? They're very cheap...

You are a star with a reasonably priced car. How great it is to have the worlds authority on Nixie tubes in our midst.

pre65 · Post by **pre65** » Wed May 28, 2014 12:31 pm

Paul Barker wrote:OK not used to this.

What about 10 of SB100 5A Schottky for £5 London source on eBay?

Would need two packs.

This one ?

http://www.ebay.co.uk/itm/10x-SB5100-5- ... 5d4970e832

are they genuine, or cheap Chinese crap ?

audio-talk

Bought Altec Lancing and Sugden Monoblocks Â£100

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