Quad 405-2 monoblocks .

[Ian Walker]

Hi All,

Here for sale is my Quad 405 Mono Blocks.All the work done on these was carried out by Duncan (Tubehunter).Rebuilt to exactly the same spec as his, these have been upgraded with four F&T 22,000 power supply capacitors, four 35 amp bridge rectifiers one per rail. RCA Phono connectors and power switch fitted.
There is one 405 mk2 board in each case, which is up to Keith Snook's Mod 3 level. Including 20A output transistors, PRP 1% resistors through out with Z-foils in key areas, OPA604AP Op-amps, new inductors, transistors polystyrene small value caps and Elna Cerefine capacitors. Limiters have been removed and Vellaman K4700 loudspeaker protection boards fitted.
The cases are a bit tatty but could easily be resprayed if you are fussy.

Not looking to profit on these just recoup expense.


If you need anymore info feel free to pm.

£650 plus post.

Ian.

[The Black Adder]

Oooh...

I have heard these and they are stonkingly good.

Great price too! :)

[Barry]

I demo'ed a pair at MiBO last year, feeding Quad 57 ESLs. Those that did listen gave favourable feedback. :)

Duncan has done an excellent job with mine.

Good luck with the sale.

[Macca]

Oooh...

I have heard these and they are stonkingly good.

Great price too! :)

Me too and yes, a steal at that price.

[Ian Walker]

Thanks Joe /macca.
Bump and offers considered.

[Ian Walker]

Still for sale these, sound much better than easter eggs :-).

[Barry]

I'm surprised these haven't sold. I have a pair and they are stunning. Duncan has taken the 405-2 up to Keith Snook Level 3 and beyond. The adoption of monoblock topology brings further advantages with reduction of inter-channel crosstalk, and the ability to 'close couple' the power amps to the speakers .

Folks, these really are excellent amps going for a reasonable price.

GLWS

[Ian Walker]

Folks, these really are excellent amps going for a reasonable price.

Thanks Barry,

Yes very surprised they're still here,powered up in upstairs system atm and sounding very good.

Offers considered on these.

Ian.

[Macca]

These are a proper cut above people, you'd hand over a couple of grand (at least) to a dealer for something new that would compete.

[Ian Walker]

Quads now sold thanks John.
Ian.

[JohnJo]

Quads now sold thanks John.
Ian.

Incoming!!!! :D

Thanks Ian, looking forward to getting a listen to these.

[JohnJo]

Quick update, amps now in service and working beautifully from my passive preamp.

They really are superb amps, drawing no attention to themselves whatsoever, just letting the music do the talking which I think is the mark of success.

But ohhh my eyes...blue LED alert :)


http://i1229.photobucket.com/albums/ee462/castle48/Lockwoods/98145031-12A5-4085-9969-8077A12E2FBB.jpg (http://s1229.photobucket.com/user/castle48/media/Lockwoods/98145031-12A5-4085-9969-8077A12E2FBB.jpg.html)

[Macca]

Blue LEDs should be banned under the Geneva Convention. It is the one thing that pisses me off about my Krell.

The acceptable colours for power amp power on LEDs are

Orange, yellow (but should be a sort of dirty yellow, not Big Bird yellow) or red.

Great amps, John, you got a massive bargain there, saved yourself thousands of pounds.

[JohnJo]

Thanks Martin, they genuinely are superb and seem to be getting better the more I use them.

Siting them close to the speakers has improved things even further. 1m speaker cables and 1.5m interconnects. Not the result you would expect with a Passive.

[petrat]

What are the speakers, John?

[JohnJo]

Lockwood Academy with Tannoy HPD 385. Originally sealed infinite baffle but I've been messing about with porting them, see here(need to update the thread actually with latest erm..engineering mods:D)

http://theartofsound.net/forum/showthread.php?44593-Lockwoods-in-da-house!-advice-please

[Ian Walker]

But ohhh my eyes...blue LED alert

Ahaa,just between me and you John,i'll whisper this ;)the blue LEDs signify that the amps are "Tubehunter 1%ers"tm.

This means that all resistors are within 1% of each other..in other words Dunc sifted through shitloads of the bloody things and selected only those of the coverted "BLUE LED"award.:)

Also you'll be pleased to know there are only two pairs in existence,yours and Barrys..:eek:

Joking aside,i'm very pleased your liking the amps(i'm sure Dunc is too)and hope you get years of fun out of them.

Regards,

Ian.

[JohnJo]

Cheers Ian, in that case, blue LEDs it is:)

[Barry]

Mine are located behind their respective speakers, so I don't notice the Blue LEDs. However if you find them too bright, put a higher value resistor in series so they draw less current.

Glad to hear you are enjoying yours John. :)

[JohnJo]

Thanks Barry, I'll leave well enough alone for now. Bit of insulating tape over them will do the same! I deliberately got the cross braces on the speaker stands fitted at the top to leave room underneath for monoblocks, just incase I ever got some. Works well. So you're running with short speaker cables too?

[Barry]

Thanks Barry, I'll leave well enough alone for now. Bit of insulating tape over them will do the same! I deliberately got the cross braces on the speaker stands fitted at the top to leave room underneath for monoblocks, just incase I ever got some. Works well. So you're running with short speaker cables too?

Yes I use any of three sets of monoblock amplifiers:

Mark Levinson ML-2,
Quad 510,

and

Duncan's 405.

In each case the speaker leads are 1 metre or less in length.

[JohnJo]

Yes I use any of three sets of monoblock amplifiers:

Mark Levinson ML-2,
Quad 510,

and

Duncan's 405.

In each case the speaker leads are 1 metre or less in length.

Thanks :cool: