Noob needs help with z5600a II mic repair

[Adam Frandsen]

What value is C3? 420v something is all I can read inside the mic, on the schematics it impossible for me…

 

[Adam Frandsen]

Given the uber-low resolution of that schematic, we can be quite certain it's supposed to be 9.1k; you probably can't even find 8.1k resistors anywhere; closest standard value is 8.16k (E192 series); 8.2k is an E6 value though.

The "debate" about this is purely academic though - as i mentioned, the exact value is NOT essential at all, in that position / role in the circuit.

Great, thanks

 

[Khron]

What value is C3? 420v something is all I can read inside the mic, on the schematics it impossible for me…

Could be 18pF, possibly? A much more standard value would be 22pF though - you might not mind if the attenuation ends up being a bit more than 10dB with the pad activated.

 

[Adam Frandsen]

Could be 18pF, possibly? A much more standard value would be 22pF though - you might not mind if the attenuation ends up being a bit more than 10dB with the pad activated.

Thanks again, and no I wouldn’t mind that really

 

[Adam Frandsen]

Reading up on the E-series it seems likely that the mic uses e24/e48 series, and I think that both 8.1k resistor and 18pF are values that fit within that series no? If I can get those that is, otherwise I understand the 9.1k and the 22pF are more common and can be used without problems.

 

[Khron]

Check the heading of the Wikipedia article i linked to in my other post. That, and the Table a bit after that.

 

[Adam Frandsen]

Check the heading of the Wikipedia article i linked to in my other post. That, and the Table a bit after that.

I see - Chat GPT once again failed, haha. So 8.2 is, and 9.1, and 18 then as well? but not 8.1…

 

[Adam Frandsen]

Would this be good for the C3 then: https://www.digikey.tw/en/products/detail/cornell-dubilier-electronics-cde/CD15CD180DO3F/1917724

or this if 22pF

https://www.digikey.tw/en/products/detail/cornell-dubilier-electronics-cde/CD15ED220DO3F/1917728

 

[Khron]

Either one should work.

And stuff like chatgpt is only as good as the stuff it's fed; it's unable to discriminate between good information and bad/inaccurate information.

 

[RoadrunnerOZ]

That cap C3 definitely looks like 18pF - readily available in 500V.
On your mic it looks like R3 is the wrong value - doesn’t look like 51M, also R6 R9 R10 look like they’re all 270K - image 031638?? R8 is different in two different photos of yours - one shows only two bands as the rest are obscured - green,brown - 5,1 - assuming 51M here - image 033858. Then the next shot with the whole resistor visible shows what appear to be orange,orange,black,green 33M image 032218 and several others. Did you change that resistor? What value is it now?

 

[Adam Frandsen]

image

I have yet to change any resistors, as my local electronics store was out of most for some reason yesterday. I could buy two 150k@2watt, which I did, and I soldered them together in a V/triangle shape, and they measure right, but they can barely fit haha, haven't soldered them on yet.

And yes, they are all 270k those three in mine, which is wrong. And one measures completely wrong too, 1.1kohm.

 

[Khron]

Just saying - 2 watt is way overrated. Even half a watt would've been more than plentiful - you'd expect maybe 1-2mA to flow through those (at idle), which works out to about 27mW. Or hell, even the full 180V that supplies the tubes, across 300k (if, say, somehow, both halves of the tube shorted out), would burn up a measly 108mW.

 

[Nen'O]

Hi,
Here are few closeups of mine Z5600. Every is ‘still’ stock design.
Hope it helps .

Cheers

 

[Adam Frandsen]

Hi,
Here are few closeups of mine Z5600. Every is ‘still’ stock design.
Hope it helps .

Cheers

Hi

That's a different model unfortunately - I have the z5600a II, the layout is different

 

[Nen'O]

Hi

That's a different model unfortunately - I have the z5600a II, the layout is different

Ok, shame. Wish I could help.
Mine looks like it’s typical CCDA that can be found in just about any Chinese multi pattern tube mic. Which is a great thing

 

[Khron]

The "II" version is the same, basically; possibly just different component values (cathode resistor for the first triode, at least).

https://groupdiy.com/threads/se-electronics.70694/post-901366
The "II" has the switchable high-pass too. Not exactly cosmic differences though, anyway.

 

[Adam Frandsen]

sE Electronics, z5600a II Resistors and Capacitors



MIC Resistors:



R1 = 1Giga-Ohm - small flat - wattage? width max 1cm

R2 = 200M - small flat - wattage? width max 1cm

R3 = 51Mega-Ohm - 1/2-1 watt

R4 = 3.9 Kilo-Ohm - 1/2-1 watt

R5 = 300 Kilo-Ohm - 3 watt

R6 = 270 Kilo-Ohm - 1/2-1 watt

R7 = 9.1 Kilo-Ohm - 1/2-1 watt

R8 = 51 Mega-Ohm - 1/2-1 watt

R9 = 1 Mega-Ohm - 1/2-1 watt

R10 = 1 Mega-Ohm - 1/2-1 watt



MIC Capacitors:



vC1 = 1000pf, 630v, 1cm lead space stretch to 1.5cm, max width 1.5 max height 1.5

C2 = 22NJ/223J, 0.022uF, 630v, lead space 1cm, width 1.2cm max 1.5cm

vC3 = 18pF, 420v

vC4 = 104J, 9mm lead space

vC5 = 100uF, 25v or above, 8mm diameter, 5mm lead space

vC6 = 1uF, 400v, 8mm diameter, 5mm lead space

C7 = 103J, 0.01uF, 450v, max width 1cm, 9mm lead space

vC8 = 1uF, 400v, 8mm diameter, 5mm lead space

C9 = 22NJ/223J, 0.022uF, 630v, lead space 1cm, width 1.2cm max 1.5cm

vC10 = 1uF, 400v, 8mm diameter, 5mm lead space

vC11 = 100uF, 25v or above, 8mm diameter, 5mm lead space

vC12 = 104J, 5mm lead space, width max 1.5cm

vC13 = 104J, 5mm lead space, width max 1.5cm



MIC Output Transistor housing: 25x40mm

MIC Output Transistor shape: Round

MIC Output Transistor nr: 5600



PSU Resistors:



R0 = Or,bl,bl,rd,br (2 watt min.)

R1 = Blu,Gr,Bl,Br,Br (2 watt min.)

R2 = Blu,Gr,Bl,Br,Br (2 watt min.)

R3 = Blu,Gr,Bl,Br,Br (2 watt min.)

R4 = Br,gr,bl,ye,br, (little unsure)

R5 = on the pattern dial, 4mm width, br,or,bl,or,br

R6 = on the pattern dial, 4mm width, br,or,bl,or,br

R7 = on the pattern dial, 4mm width, br,or,bl,or,br

R8 = on the pattern dial, 4mm width, br,or,bl,or,br

R9 = on the pattern dial, 4mm width, br,or,bl,or,br

R10 = on the pattern dial, 4mm width, br,or,bl,or,br

R11 = on the pattern dial, 4mm width, br,or,bl,or,br

R12 = on the pattern dial, 4mm width, br,or,bl,or,br

R13 = Rd,bl,bl,silv,br (2 watt min.)

R14 = or,bl,bl,or,br

R15 = gr,br,bl,re,br (tiny)

R16 = sl/gr,re,bl,bl,br tiny

R17 = or,bl,bl,or,br

R18 = or,bl,bl,or,br

R19 = re,vi,bl,re,br



PSU Relay:

• Model: JQC-3F
• Coil Voltage: 12VDC
• Contact Ratings: 10A/240VAC, 12A/125VAC, 30VDC, 28VDC

PSU Capacitors:



C01 = 1uF, 400v, 8.5mm diam. room for bigger,

C1 = 47uF, 400v, 16mm diam., 2.5cm height max 5cm

C2 = 47uF, 400v, 16mm diam., 2.5cm height max 5cm

C3 = 47uF, 400v, 16mm diam., 2.5cm height max 5cm

C4 = 100uF, 250v, 16mm diam., 3cm height max 5cm

C5 = 220NJ, 400v, 1.8-2cm width,

C6 = 3300uF, 16v, 13mm diam., 2.5cm height max 5cm

C7 = 6800uF, 16v, 16mm diam., 3cm height max 5cm

C8 = 220uF, 25v, 8.5mm diam.,

C9 = 100uF, 16v, 5.2mm diam.,

C10 = 47uF, 25v 5.2mm diam.,

C11 = 103, no voltage written, tiny, 5mm lead space, plenty of space around and top

C12 = 1uF, 50v, 5.2mm diam.,

C13 = 1uF, 50v, 5.2mm diam.,

C14 = 104J, 60v, 8-10mm width,

CDial = 1uF, 400v

 

[Adam Frandsen]

Ok, shame. Wish I could help.
Mine looks like it’s typical CCDA that can be found in just about any Chinese multi pattern tube mic. Which is a great thing

There are indeed similarities looking at the schematic, so surely it can be a help to have that as it is clearer!

 

[Khron]

R5 = 300 Kilo-Ohm - 3 watt

As already mentioned, NO point in such a huge resistor there - 1/2 watt is more than enough.

 

[Adam Frandsen]

As already mentioned, NO point in such a huge resistor there - 1/2 watt is more than enough.

I just wrote what is on the schematic in the lower left corner - other pictures I have seen have 2 watt in there, the z5600 schematic says 1 watt there, and Roadrunner also said 1 watt…