Yep they're the ones. They are known to dry out no crack and eventually release the smoke when unused for years, but I got a look at one I put in 11 years ago this week and it is still fine.
EJP
EJP
Thanks EJP
Found a few more faults in 22.2 loose wires and R31 seems very high.Read them all in circuit and most pretty near but R31 should be 47K and its reading 116K.
John
Found a few more faults in 22.2 loose wires and R31 seems very high.Read them all in circuit and most pretty near but R31 should be 47K and its reading 116K.
John
This is typical, and it's why I always replace every resistor attached to the triple capacitor. I've seen the 15K one go as high as half a G while still actually conducting. The pink 470K and 270K ones on the other hand never seem to budge.
Thanks EJP
Yep most of the pink ones are bang on apart from R24 a bit out at 484K
So resistors R20,R25,R31 and R32.
Must say i'm enjoying researching and learning about the pre and power amps
John
Yep most of the pink ones are bang on apart from R24 a bit out at 484K
So resistors R20,R25,R31 and R32.
Must say i'm enjoying researching and learning about the pre and power amps
John
Been looking long and hard and just cant see how I can fit an iec socket without cutting the chassis.I would prefer signals at one end and mains at the other.Can fit a phono connector where the 6 pin Morgan is and the binding posts where the 2 pin main input is.Or maybe put rca input where one output socket is and fill the other one in.
Still working on it.
Still working on it.
Use the cloverleaf style laptop IEC connectors (C5 and C6).
Mount the socket on an aluminium plate. If you really want to not make any holes it would be possible to use the power selector bolt hole, and two of the maker's plate holes on the side. I drilled two small holes, plus one more for an earth point, next to the fuse holder, on the side of the amp.
Mount the socket on an aluminium plate. If you really want to not make any holes it would be possible to use the power selector bolt hole, and two of the maker's plate holes on the side. I drilled two small holes, plus one more for an earth point, next to the fuse holder, on the side of the amp.
Attachments
Thank Old Hector
Some bits on the way.About 10 resistors for the 22 plus suppression caps for switch and
new electrolytics.Need top get the film caps.Plus 180R 6.5 watt plus 25uf for power amps.
And some more bits for my Pioneer BDP-LX91
Smiffy
Some bits on the way.About 10 resistors for the 22 plus suppression caps for switch and
new electrolytics.Need top get the film caps.Plus 180R 6.5 watt plus 25uf for power amps.
And some more bits for my Pioneer BDP-LX91
Smiffy
I’m not entirely clear why you’re adding phono jacks if you have a 22? The power amps don’t have a blocking cap on the input as that is handled by the 22. If you change it to phono you’re going to want to add a blocking cap to the input, but that may mess with the 22 input, depending on where you put it.
I’ve got a pair of these that I have refurbed, as well as a 22. The main problem with most 22s that I’ve seen is that the volume / balance / power pot goes and it’s hard to find a suitable replacement. Also changing the caps and resistors in the tone circuit can be a real challenge.
I’ve got a pair of these that I have refurbed, as well as a 22. The main problem with most 22s that I’ve seen is that the volume / balance / power pot goes and it’s hard to find a suitable replacement. Also changing the caps and resistors in the tone circuit can be a real challenge.
Check out Patrick Turner's pages for Quad. There are a couple of things you can do for stability. I used a 0.1uF MKP for the coupling cap, and added another resistor from the grid of the EF86. (I missed that at first, and had oscillation when unplugging inputs).
The snag with the quads is the volume control. I was thinking that a minimalist control unit with a volume control, even an on off switch, would be great since sensitivity is plenty high enough for coupling to a CD player or blue tooth adaptor, so the control unit is redundant apart from volume.
The snag with the quads is the volume control. I was thinking that a minimalist control unit with a volume control, even an on off switch, would be great since sensitivity is plenty high enough for coupling to a CD player or blue tooth adaptor, so the control unit is redundant apart from volume.
Thanks for reply Ahankinson
Need to use the 22 until I can add phono sockets etc to the power amps.Only have 2 sources and they both have dc blocking output caps.
But would rather get the 22 working first and check it as a few faults.Found the 22 far to sensitive for cd so going to make up some attenuators.Was a real pain to get the on/off switch out to replace the two blown suppression caps..Also a few resistors out of spec.
Did quite like the 22 with the power amps but would like to try an active pre amp(Classe CP35 and a passive.(Tilsbury Audio switched att)
Regards
John
Need to use the 22 until I can add phono sockets etc to the power amps.Only have 2 sources and they both have dc blocking output caps.
But would rather get the 22 working first and check it as a few faults.Found the 22 far to sensitive for cd so going to make up some attenuators.Was a real pain to get the on/off switch out to replace the two blown suppression caps..Also a few resistors out of spec.
Did quite like the 22 with the power amps but would like to try an active pre amp(Classe CP35 and a passive.(Tilsbury Audio switched att)
Regards
John
Thanks OldHector.Found it
may have to rewire a few bits in 22.Not sure if its 24 gauge or 22.I think 24
John
may have to rewire a few bits in 22.Not sure if its 24 gauge or 22.I think 24
John
You can get six pin to rca adapters, so you don’t need to remove the Jones plug. Then you just need to change a regular mains cord to one of the two-pin mains cord (with an earth lead fitted that goes to a screw on the chassis) and you should be OK without making any changes to the chassis.
Quad II Jones 6 pin to RCA/phono adaptor one pair: Gold plated phono blue/yellow | Mysite
Quad II Jones 6 pin to RCA/phono adaptor one pair: Gold plated phono blue/yellow | Mysite
Ta all for the information everybody.Much appreciated.had to re order suppression caps as got the wrong value.got 0.47uf instead of 0.047uf.Stupid boy.
Looking to match the valves in the 2s.pinched the 2 EF86s out of 22 so now one Quad has miniwatt EF86s and Miniwatt KT66s.other has mullard EF86s and GEC KT66s
John
Looking to match the valves in the 2s.pinched the 2 EF86s out of 22 so now one Quad has miniwatt EF86s and Miniwatt KT66s.other has mullard EF86s and GEC KT66s
John
Does anyone know what size bolts are used on the Quadiis Obv imperial but would be nice to get some new ones.Ta for any help.John
Found some inf on Keith Snooks brill site but wondered if any misses.So far have 2BA and 4BA
Found some inf on Keith Snooks brill site but wondered if any misses.So far have 2BA and 4BA
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Thanks EJP.
There seems to be 4 different ones.4 big holding mains transformer on,smaller ones holding KT66 sockets,output transfomer.GZ32 socket and 6 pin jones socket and 2 pin main in then 4 smaller holding the EF86s and 2 holding the choke.cant find a diagram anywhere to match the bolts with the sizes.
There seems to be 4 different ones.4 big holding mains transformer on,smaller ones holding KT66 sockets,output transfomer.GZ32 socket and 6 pin jones socket and 2 pin main in then 4 smaller holding the EF86s and 2 holding the choke.cant find a diagram anywhere to match the bolts with the sizes.