Hi, Had a look through a few data books and the nearest I can find is the 1S2000 to 1S7000 series of 400mW Zener's which was made by Texas, but I can't find a...
Hi, Found it!! - there was a data book at the bottom of the pile I missed - Do'h...!! The 1S2120 is a 12V 400mW 5 Percent tolerance Zener. A BZX55C12 would do...
NICE ONE Terry- Thanks for your time on this, I should be able to get one of those diodes ok. Im hoping to rebulit the PSU board to at least be able to get the...
Alan, only changing all electrolitic capacitors with new good audio grade electrolitic capacitors you can return your Quad 303 to a very good amplifier, better...
Thanks Gian Luca I have not changed the big caps as yet, but I must do so. Have you changed the transistors. I was thinking I may not be getting the power...
Hello all :-) I am about to swap all the caps on our 2 303's, I will use RIFA PEH200PD4470M 4700uf 100VDC to replace the power supply and the output caps (the...
actually im onlt getting low voltage -31v where theres supposed to be 67v is it 67v from earth to pin 12 on the psu board? ... to ... output ... needed ... ...
Hello all, I'm new to this group, although I've had Quad gear for years now. Currently I'm using a slightly modded 44 into a pair of II's (with Saratovs and...
... What happens if you swap the Quad IIs over, but leave the cables where they are? Does the hum follow the amp? ... have you thought of unscrewing them from...
Stephen Robinson
heiferboy@...
Jan 2, 2004 8:59 pm
1883
... Hi, Yep it does. I also tried swapping the KT66's, but the hum stayed with the amp, didn't follow the valves. Cheers // Simo...
Hi, Measure the regulated supply to the amplifier across pins 12 & 13 (on power supply PCB) which should read 67V Voltages to check - Raw supply voltage across...
Hi, Bit more..... I'm assuming the (active crossover) filter takes it's power from the 303 amp, and if so where in the circuit? Are both 303 amps showing the...
Hi, Thanks for your replies to my questions about powering up Quad 1l's independently and running a cd through a 22. I'm pondering other alternatives. I read...
John, It should be possible to modify the output of the QUAD 33 to drive the 1.4 volts required by QUAD IIs to reach maximum output. Contact Rob Flain at ...
hi thanks for the help:) I measured the voltages between 12 & 13 theres only 29v ( cant get this any higher by turning the adjuster) 12 & 15 theres 85v (so i...
theres a circuit board m12412 attached to the front of the amp. It must be a regulator to feed the crossovers. I will post a picture in the files section under...
Hi, Sounds like the problem area is the Zener diode or the resistor feeding it. Could be one of the following :- Short circuit Zener Diode - check by using...
the zener is open circuit - the resistor seems fine -its a 10k is there an equivilent zener diode i could use - or is there any way of using a standard diode...
Hello Simo! Happy New Year! ... Go to www.diyaudio.com for postings concerning the phono input. I have the ISS 4 phono card, without the transistors at the...
... It's not just about the sound pressure. There's dipole phase cancellation and diaphragm resonant frequency, as well. Phase cancellation gets worse as the...
... Hi Tom, It seems that the newer models have a completely different phono board. My old 44 phono doesn't have a choke at all and uses transistors + opamps...
Hi, Personally I would use a 400mW 12V zener, using 1N4003's is not feasible (you would need some thing like 18 of the 1N4003's in series...!!). The current...
thanks for taking the time to explain the psu side of the quad303. Thank to your advice I have sorted the problem with one of my amsp and I am working on the...
Hi, Great.....Sounds like all's ok by replacing the diodes. It's a good idea to use the 1.3W diodes. This combination of power amp, crossover and speaker...
its nice to get the 303's back to working order again. The quads,freq amp and LS3/7/145 speakers were being dumped is a nice combo. It was originally designed...
... SNIP ... Seems like there's a genuine 303 revival going on! ;-) Does anyone care to share some good mail order sources for blackgate caps? Quad refurbed my...
Hi Henk I'm another fool who sold my 303 in order to finance a 405-II some years ago :-( Still, using Quad IIs now so audio life is good! :-) I have bought...
Hi Paul, Afraid I am an even bigger fool. Sold my 22/II's last month and bought a spare 303 last week. ;-) Thanks for the Audiocom link, I will take a look as...
Hi, Ahh....AC/DC....nice... Recently bought High Voltage and If You Want Blood You've Got It on 180g Vinyl Reissue......great stuff. I'd be interested in any...
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