Ill exchange all the cabs on driver board pcb . But I dont get the /
diff pair / thats a transistor that recieves the imput and ouput ?
hard whit no 16a sevice manual manual ..
Another point . The relay betwean the pcbs shoud disconect the speakers for aboud 2 seconds befor kickn in . It doesnt work . Got a thumb at powering up .. The relay klicks if putting in 12 volt dc so thats not it .
ALso bought a phase linear 400 , looks like a silly toy compared to the sitation 16 a . But sounds rather nice thoug !
My phase has a speaker protection pcb build in !
thanks for all the comment
diff pair / thats a transistor that recieves the imput and ouput ?
hard whit no 16a sevice manual manual ..
Another point . The relay betwean the pcbs shoud disconect the speakers for aboud 2 seconds befor kickn in . It doesnt work . Got a thumb at powering up .. The relay klicks if putting in 12 volt dc so thats not it .
ALso bought a phase linear 400 , looks like a silly toy compared to the sitation 16 a . But sounds rather nice thoug !
My phase has a speaker protection pcb build in !
thanks for all the comment
http://www.semelab.co.uk/pdf/bipolar/2N2914_8.pdf
here a pdf of the 2n2916 .Seems realy hard to get . Is it possible to une 2 normal npn transistors ?
here a pdf of the 2n2916 .Seems realy hard to get . Is it possible to une 2 normal npn transistors ?
Iam going to replace alot of the citation 16 a electronics. 1 Of the origional rca 0404D ( rca 1B04) is not working anymore . Iam planing to exchange all the output transistors whit the MJ15024 ( mot ) But I nead to now a replacement for the NPN power transistor to ( q1 and q2 on the heatsink ) ( rca 1025C )
In my pdf service manual of the citation 16 series a some of the small transistors on the driver board I nead to replace are called PNP GP .( can read M641 27722 on the transistors )
The aligment procedure of the 16 series a is also differend compared to the 16 vr2 neads a 50 MV offset .
If anyone would like the citation 16 a manual and give some assistance on finding replacement parts Please !
In my pdf service manual of the citation 16 series a some of the small transistors on the driver board I nead to replace are called PNP GP .( can read M641 27722 on the transistors )
The aligment procedure of the 16 series a is also differend compared to the 16 vr2 neads a 50 MV offset .
If anyone would like the citation 16 a manual and give some assistance on finding replacement parts Please !
Iam almost done restoring the citation 16a . exchanged all the transistors on the plate amp . The only parts I miss now are the NPN power transistors Q1 and Q2 . All transistors are exchanged whit MJ15024 s .
Any sugestions ? Doest the power npn have to be compatible whit the MJ15024 s ?
thanks in advance
Any sugestions ? Doest the power npn have to be compatible whit the MJ15024 s ?
thanks in advance
The original part of the citation sixteen is a 1025c .
http://www.geocities.com/waklobe/switchtrans.htm
<.> 1025C H-KARDON = 122N2 = 2003212204 = 2928A = 2N6511 = 2SC1142 = 2SC2121 = 2SD266 = 2SD293 = 2SD394 = 3068 RCA = 38C-200-113 = 43032928A = 4822-130-41021 = 561-6806-307 = 57B196-10 = 64033 = 65165 = 65982 = 66883 = 68548 = B23-120 = BDX23 = BDY27 = BU208 COMPUTER = BUY69B = C2121 TRANS = CV109 = D273 TRANS = D312 TRANS = D429 TRANS = LX283 = MJ9000 = RCA1B09 = WEP770/283 = (NPN Si Transistor, Switching, TV Horizontal Output)
Above the hk 1025c iam trying to vind . I guess that all the folowing transistors are suitable replacement parts . BUY69B is (the same ) part as a BUX80 .
So Iam looking for a switsching transistor
Is it that easy to find spare parts or M I overlooking some importand stuff.
For the record i replaced all standard transistors whit mj15024
http://www.geocities.com/waklobe/switchtrans.htm
<.> 1025C H-KARDON = 122N2 = 2003212204 = 2928A = 2N6511 = 2SC1142 = 2SC2121 = 2SD266 = 2SD293 = 2SD394 = 3068 RCA = 38C-200-113 = 43032928A = 4822-130-41021 = 561-6806-307 = 57B196-10 = 64033 = 65165 = 65982 = 66883 = 68548 = B23-120 = BDX23 = BDY27 = BU208 COMPUTER = BUY69B = C2121 TRANS = CV109 = D273 TRANS = D312 TRANS = D429 TRANS = LX283 = MJ9000 = RCA1B09 = WEP770/283 = (NPN Si Transistor, Switching, TV Horizontal Output)
Above the hk 1025c iam trying to vind . I guess that all the folowing transistors are suitable replacement parts . BUY69B is (the same ) part as a BUX80 .
So Iam looking for a switsching transistor
Is it that easy to find spare parts or M I overlooking some importand stuff.
For the record i replaced all standard transistors whit mj15024
Q11 and Q12 drivers
If I understand DJK and Burned Fingers correctly, when replacing the RCA1B04's with MJ15024's, it would be good practice to replace the drivers Q11-12.
Elsewhere, I found cross-reference of the HK part # 1025c which I'm pretty sure is a RCA 1B05, to a 2N6511 = NTE283. This is an NPN, TO3 Horizontal output switch with high speed and excellent fall time. VCEO of 325v, VCE of 800v and Veb of 8v. Collector current is 10A continuous, 15A peak. Power dissipation is 100w, and operating junction temperature is +200C.
On the face of it, these seem like perfect devices to throw in with the likes of the MJ15024s, or would I be better off replacing Q11-12 with MJ15024s as well?
P. S. I've found a US supplier of the UA739PC input opamp for two bucks. Elsewhere, (like Germany) I've found 'em for from about $1.45 to $2.60. I' m gonna buy about twenty of the things to get two for my little project, a sick Citation 16.
ALL electrolytic caps are being replaced, need it or not!
I value any opinion offered regarding this substitution.
If I understand DJK and Burned Fingers correctly, when replacing the RCA1B04's with MJ15024's, it would be good practice to replace the drivers Q11-12.
Elsewhere, I found cross-reference of the HK part # 1025c which I'm pretty sure is a RCA 1B05, to a 2N6511 = NTE283. This is an NPN, TO3 Horizontal output switch with high speed and excellent fall time. VCEO of 325v, VCE of 800v and Veb of 8v. Collector current is 10A continuous, 15A peak. Power dissipation is 100w, and operating junction temperature is +200C.
On the face of it, these seem like perfect devices to throw in with the likes of the MJ15024s, or would I be better off replacing Q11-12 with MJ15024s as well?
P. S. I've found a US supplier of the UA739PC input opamp for two bucks. Elsewhere, (like Germany) I've found 'em for from about $1.45 to $2.60. I' m gonna buy about twenty of the things to get two for my little project, a sick Citation 16.
ALL electrolytic caps are being replaced, need it or not!
I value any opinion offered regarding this substitution.
I didnt replace the power caps. They stil work . Similar sized caps are 40 000 uf a piece . They are also expencive. And youl nead some kind of soft start .
Iam not a real believer of large power caps . That is whit normal lisning levels. A Phase lineair 400 only has only 2 4800 uf caps and more clean power then the citation .
Iam not a real believer of large power caps . That is whit normal lisning levels. A Phase lineair 400 only has only 2 4800 uf caps and more clean power then the citation .
Caps
Yeah,
40000 x 2 =80000 uf / channel. That would be a gob of capacitance. These guys are 10000 each, same as stock. I'm not comfortable putting in more than the designer planned. I don't know that much about audio amps. Medical electronics is my bag, we don't do much wild substitution there either,
So, the Phase Linear has more usable power, eh? What's up with that, does it use a discrete input amp, better components, design or all of the above? I've never monkey'd with one.
Well. I'm sticking a whole bunch of filter caps and the outputs into this thing right now. Idea's to refurbish the amp, and maybe make it sound a little better than new. I do think the Citation Nineteen shows more finese than this thing, thank you again for the clarification on the 15024s.
Yeah,
40000 x 2 =80000 uf / channel. That would be a gob of capacitance. These guys are 10000 each, same as stock. I'm not comfortable putting in more than the designer planned. I don't know that much about audio amps. Medical electronics is my bag, we don't do much wild substitution there either,
So, the Phase Linear has more usable power, eh? What's up with that, does it use a discrete input amp, better components, design or all of the above? I've never monkey'd with one.
Well. I'm sticking a whole bunch of filter caps and the outputs into this thing right now. Idea's to refurbish the amp, and maybe make it sound a little better than new. I do think the Citation Nineteen shows more finese than this thing, thank you again for the clarification on the 15024s.
Adding power capacitors to Citation 16
I have 3 citation 16 amps. For many years now, say at least 15 years, I have added large Mallory capacitors of 36,000 mf each.
2 amps have 4 extra caps of 36,000 mf. The third has an extra 2 caps of 36,000 mf.
The difference in the sound is night & day. I have done this before with other amps. Once you hear waht extra caps do - you will never take them off. I have done the same with my Audio Research SP-7 pre amp with similar results.
Any event, since the caps have been on the Citations for so long, I do no see or had any problems.
The caps are tied on top of the amp and connected in parrallell to each internal power caps..
One of my amp is a Citation 16A - does anybody know the difference between the 16 A and the 16 ??
thanks
I have 3 citation 16 amps. For many years now, say at least 15 years, I have added large Mallory capacitors of 36,000 mf each.
2 amps have 4 extra caps of 36,000 mf. The third has an extra 2 caps of 36,000 mf.
The difference in the sound is night & day. I have done this before with other amps. Once you hear waht extra caps do - you will never take them off. I have done the same with my Audio Research SP-7 pre amp with similar results.
Any event, since the caps have been on the Citations for so long, I do no see or had any problems.
The caps are tied on top of the amp and connected in parrallell to each internal power caps..
One of my amp is a Citation 16A - does anybody know the difference between the 16 A and the 16 ??
thanks
i recently repaired a citation 16. when i powered it up, one channel had 1.5V offset. i was able to adjust it down to +/-1mV, after letting the amp stabilize temperature for 15min.
i've used MJ15022's as a "general upgrade" for many quasi comp amps. now that 15022's aren't made anymore, i use 15024's for this. i suppose you could also use 2SC5200's if you want to go to plastic package devices.
as far as the op amp goes, the difference that contributes to oscillation is the increased slew rate of the newer device, while the phase shift and propagation delays of the rest of the amp remains the same. you could try increasing the compensation capacitance in the VAS or driver stage, or just pick a slower op amp. as long as the slew rate isn't slower than the original op amp, it shouldn't degrade the sound of the amp at all.
i've used MJ15022's as a "general upgrade" for many quasi comp amps. now that 15022's aren't made anymore, i use 15024's for this. i suppose you could also use 2SC5200's if you want to go to plastic package devices.
as far as the op amp goes, the difference that contributes to oscillation is the increased slew rate of the newer device, while the phase shift and propagation delays of the rest of the amp remains the same. you could try increasing the compensation capacitance in the VAS or driver stage, or just pick a slower op amp. as long as the slew rate isn't slower than the original op amp, it shouldn't degrade the sound of the amp at all.
UA 739
As I mentioned in an earlier post, I did buy a bunch of UA739PC opamps date coded 8350 Korea. They are available to anyone needing one, (or more), for two bucks each plus postage. That's about what they cost me. These are for the Citation 16, not the 16A. Contact me via email notification and I'll be happy to follow up.
As I mentioned in an earlier post, I did buy a bunch of UA739PC opamps date coded 8350 Korea. They are available to anyone needing one, (or more), for two bucks each plus postage. That's about what they cost me. These are for the Citation 16, not the 16A. Contact me via email notification and I'll be happy to follow up.
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