the Poor Man 660 support thread

[[silent:arts]]

bernd, thanks for answering all the questions :thumb:
have been away from the internet for a few days.

to make some things clear I read in the last posts:

PMs or eMails are the very wrong way to get support for this project.
ask your questions in here this thread.

neither bernd nor me are designers of the circuit. this is one reason we can't answer questions about the design. if you have questions about the PCB design I can give you the answers, but NOT about the schematic.

components: some components are suggested by the designer of the circuit (WIMAs, VUs). fact is they work, thus I don't question it. if you don't want to use those parts - it is still DIY - and you have to find out yourself if they work.

VUs: the original used VUs, diode bridge removed. the original showed gain reduction only, no output or input level. if you want to switch between gain reduction and output it may be possible using a VU meter, but this is DIY again.

best
:sam: :guinness: :sam: :guinness:

 

[analag]

There is no huge voltage drop across the VU meter. Most modern VU's will work just fine, simply parallel connect a variable resistance across the VU terminals and that's it. If you want want to have the VU showing input, output and GR, then you will have to do the connections via switch which really ain't hard at all.

analag

 

[Moby]

Thanks guys, I'm really sorry if I hurt someone's feelings, but some things are really confusing me. OK, I will stop asking about VU ma meter, but since I still don't have all my parts collected (transformers and tubes) I would like to prepare all mechanics etc.... That's why I constantly and desperately ask about current through meter. Also, since this is DIY some segments are left to be customized what I really like :grin: , so please if it's possible tell me about current in the 1st stage. Or, voltage at the top of the meter and bottom... :thumb: One more info will be useful. Current with maximum Gain reduction. Thanks (without inappropriate emoticons) :wink:

 

[elektrovolt]

today I did the psu and compressor pcb stuffing, dead easy ! these pcb's are very well made !

yesterday they delivered the case. still awaiting the edcor's and the rotary switches...

some pics: http://www.mijnalbum.nl/Album=ALRKO4FX

 

[bernbrue]

[quote author="Moby"]Thanks guys, I'm really sorry if I hurt someone's feelings, but some things are really confusing me. OK, I will stop asking about VU ma meter, but since I still don't have all my parts collected (transformers and tubes) I would like to prepare all mechanics etc.... That's why I constantly and desperately ask about current through meter. Also, since this is DIY some segments are left to be customized what I really like :grin: , so please if it's possible tell me about current in the 1st stage. Or, voltage at the top of the meter and bottom... :thumb: One more info will be useful. Current with maximum Gain reduction. Thanks (without inappropriate emoticons) :wink:[/quote]

Since you changed your avatar, your postings leave a much better impression. :wink: :green:

without any meter attached, measured at PL3:
max GR: 54,3V
min. GR: 54,7V
I close my PM670 now and put it back into the rack,ok?

regards
Bernd

 

[Moby]

Thanks Bernd. I'm glad you like mu new-old avatar :wink:
I presume that voltages are after 22k resistor... or some other value maybe?? Hmmm, I'm a bit confused with voltage results, strange, I expected some current change with gain reduction. 0.4v looks more like mains variation :wink: I hope you didn't just turned the treshold pot without signal.... Anyway, if you measured through 22k resistor 80V drop is telling that unit can't work normally without meter. If someone really want to switch the meter from GR to Out switching scheme must include additional resistor instead of meter. In that circumstances (I think that recommended meter has DC res around 1k) 1k parallel to 22k will do the proper job.

 

[Moby]

[quote author="Gachet"]:? nobody has an idea?

I am really in a deadlock.I need a few answers to understand how the psu is supposed to behave.
Can someone at least explain me what is going on around the irf 820 Q4?
What voltage do you have on pin 2 of Q4?

If Q5 is not fed with 245 V it won't be abble to supply 136V because of fixed gain, right?

thanks[/quote]
I don't know did you solved your problem but anyway, I will try ho help. Pin2 of Q4 should have voltage close to source because it has just small (47) resistance in series. So I should say it should be around your voltage after bridge. BTW, are you measure PSU disconnected from unit? Fat can be sensitive to "open" infinite resistance. About Q5 you are right ,it it does not stabilize the voltage but it's capable for variable current without voltage swing. You must have stable 245V on input to measure 135V. Since you have 188V on the Q5 it's normal that output voltage is around 100v.Hope it helps, since I still don't have my unit working this calculation is just from theory so someone should confirm this from measuring.

 

[Gachet]

Thanks Moby

No I haven't solved my problem as long I am waiting for new fet and zener to build again the 245 V supply.

So I think :
-I won't power the psu without charge
-I will mount the fet with myself connected to earth

And hope it will work...

 

[Moby]

one more (maybe stupid) question. Did you double checked the resistors values?

 

[Gachet]

Yes ... Measured and color code check before etching.
And color code check while troubleshooting.

 

[Moby]

do you have 100v on zener? If yes than must be broken fet...

 

[Gachet]

I'll check this after I rebuilt the psu
At the moment it's out of order because of desoldering etc...

 

[labak]

Hi ALL!

I'm looking at this schemo and i'm thinking about adding an SRPP output, with an ECC83 going to an ECC82, make up, or recovery or like you want!

Who could tell me if it is possible or not!

Who already think about it?

Tell me more!

Cheers

 

[mrclunk]

:?: What is point, extra gain stage :?:

There's plenty of gain.

 

[labak]

Would you like to say it's an automatic gain compensation!

It gives automaticly what it's reducing?

 

[SIXTYNINER]

PLEASE DON'T WORRY!!!
TAKE A FREE DRINK FROM OUR FULL FREEZER
AND BE QUITE
WE ARE FILLING A NEW FULL BOM LIST WITH MORE DETAILS
DIRECT LINKS PRICE ECC....
ABOUT
PM+660 PART LIST .
WELLCOME IS WHO WONT TO ADD SOME DATA - (THANKS IN ADVANCE)
***
1)
ALL RESISTORS MUST BE 250-350-700....VOLTS???

2)
TRIMPOT - 5K BY MOUSER CODE 3296Y-1-502LF http://www.mouser.com/Search/ProductDetail.aspx?qs=T7l%2fPuJnbcQ857qUhxMrRA%3d%3d
Manufacturer: Bourns
Product Category: Trimpots - Multi Turn
Resistance: 5 K Ohms Tolerance: 10 %
Power Rating: 1/2 W
Operating Temperature Range: - 55 C to + 150 C
Dimensions: 9.53 mm W x 9.53 mm L
Product: Trimpots
Termination Style: Radial
OK WITH ABOVE SPECS?

3) CAPACITORS
1 x 220n WIMA MKS2 C3 MOUSER CODE - MKS2-.022/63/10http://www.mouser.com/Search/ProductDetail.aspx?qs=Vi0JKjFBtYlk%252baz8u5C7Kw%3d%3d
Manufacturer: WIMA
Product Category: Polyester Film Capacitors
RoHS: Details
Capacitance: 0.022 uF
Tolerance: 10 %
Voltage Rating: 63 Volts
Operating Temperature Range: - 55 C to + 100 C
Termination Style: Radial
Dimensions: 2.5 mm W x 7.2 mm L x 6.5 mm H
Product: Metallized Polyester Film Capacitors
Lead Spacing: 5 mm
-

1 x 15 WIMA MKS2 C1MOUSER CODE - MKS2-1.5/63/5http://www.mouser.com/Search/ProductDetail.aspx?qs=Vi0JKjFBtYked8ouHkpvPA%3d%3d
Manufacturer: WIMA
Product Category: Polyester Film Capacitors
RoHS: Details
Capacitance: 1.5 uF
Tolerance: 5 %
Voltage Rating: 63 Volts
Operating Temperature Range: - 55 C to + 100 C
Termination Style: Radial
Dimensions: 5.5 mm W x 7.2 mm L x 11.5 mm H
Product: Metallized Polyester Film Capacitors
Lead Spacing: 5 mm
-
2 x 10 WIMA MKP4 C2,C4MOUSER CODE - MKP4-10/250/10http://www.mouser.com/Search/ProductDetail.aspx?qs=Vi0JKjFBtYn4RFg1reqifQ%3d%3d
Manufacturer: WIMA
Product Category: Polypropylene Capacitors
RoHS: Details
Capacitance: 10 uF
Tolerance: 10 %
Voltage Rating: 250 Volts
Operating Temperature Range: - 55 C to + 100 C
Termination Style: Radial
Dimensions: 19 mm W x 41.5 mm L x 32 mm H
Product: Metallized Polypropylene Capacitors
Lead Spacing: 37.5 mm
-
4)DIODES
4 x 1N4148 D1,D2,D3,D4 MOUSER CODE -78-1N4148http://www.mouser.com/Search/ProductDetail.aspx?qs=TNTIDjy6APqozHdyHHFUGA%3d%3d
Product Category: Diodes (RF, Signal, Switching, Power)
RoHS: Details
Configuration: Single
Termination Style: Through Hole
Package / Case: DO-35
Reverse Voltage: 100 V
Forward Voltage: 1 V @ 0.01 A
Forward Continuous Current: 0.15 A
Max Surge Current: 2 A
Reverse Current IR: 0.025 uA
Recovery Time: 8 ns
Packaging: Reel
Product: Switching Diodes
PartsPerReel: 10000
-
5-TUBES:
www.tubedepot.com
DON'T HAVE NOS STOCK WITH THIS CODES
2 x 6BC8 V1,V2www.tubedepot.com NOS-6BC8

THEY OFFER REPLACEMENT WITH THIS CODE
2 x 5687 V3,V4www.tubedepot.com NOS-5687
THEY OFFER REPLACEMENT WITH THIS CODE

6-SOCKETS:
FOR NOW CODES CORRESPOND
4 x Noval Ceramic PCB 18mm V1,V2,V3,V4
www.tubedepot.com SK-9PINPC2
www.tube-town.net sk-9-18-PCB
-
TO BE CONTINUED..........

 

[SIXTYNINER]

7-TRANSISTORS:
:guinness: :sam: :sam: :guinness: :sam: :!:

 

[SIXTYNINER]

7-TRANSISTORS:
:guinness: :sam: :sam: :guinness: :sam: :!:

 

[mrclunk]

It gives automaticly what it's reducing?

Oh, is that what SRPP means?

suppose that might be cool, could just push up the fader tho.
gona need a bigger box... what are we on now 5U!

 

[SIXTYNINER]

PLEASE DON'T WORRY!!!
TAKE A FREE DRINK FROM OUR FULL FREEZER
AND BE QUITE
WE ARE FILLING A NEW FULL BOM LIST WITH MORE DETAILS
DIRECT LINKS PRICE ECC....
ABOUT
PM+660 PART LIST .
WELLCOME IS WHO WONT TO ADD SOME DATA - (THANKS IN ADVANCE)
***
1)
ALL RESISTORS MUST BE 250-350-700....VOLTS???

2)
TRIMPOT - 5K BY MOUSER CODE 3296Y-1-502LF http://www.mouser.com/Search/ProductDetail.aspx?qs=T7l%2fPuJnbcQ857qUhxMrRA%3d%3d
Manufacturer: Bourns
Product Category: Trimpots - Multi Turn
Resistance: 5 K Ohms Tolerance: 10 %
Power Rating: 1/2 W
Operating Temperature Range: - 55 C to + 150 C
Dimensions: 9.53 mm W x 9.53 mm L
Product: Trimpots
Termination Style: Radial
OK WITH ABOVE SPECS?

3) CAPACITORS
1 x 220n WIMA MKS2 C3 MOUSER CODE - MKS2-.022/63/10http://www.mouser.com/Search/ProductDetail.aspx?qs=Vi0JKjFBtYlk%252baz8u5C7Kw%3d%3d
Manufacturer: WIMA
Product Category: Polyester Film Capacitors
RoHS: Details
Capacitance: 0.022 uF
Tolerance: 10 %
Voltage Rating: 63 Volts
Operating Temperature Range: - 55 C to + 100 C
Termination Style: Radial
Dimensions: 2.5 mm W x 7.2 mm L x 6.5 mm H
Product: Metallized Polyester Film Capacitors
Lead Spacing: 5 mm
-

1 x 15 WIMA MKS2 C1MOUSER CODE - MKS2-1.5/63/5http://www.mouser.com/Search/ProductDetail.aspx?qs=Vi0JKjFBtYked8ouHkpvPA%3d%3d
Manufacturer: WIMA
Product Category: Polyester Film Capacitors
RoHS: Details
Capacitance: 1.5 uF
Tolerance: 5 %
Voltage Rating: 63 Volts
Operating Temperature Range: - 55 C to + 100 C
Termination Style: Radial
Dimensions: 5.5 mm W x 7.2 mm L x 11.5 mm H
Product: Metallized Polyester Film Capacitors
Lead Spacing: 5 mm
-
2 x 10 WIMA MKP4 C2,C4MOUSER CODE - MKP4-10/250/10http://www.mouser.com/Search/ProductDetail.aspx?qs=Vi0JKjFBtYn4RFg1reqifQ%3d%3d
Manufacturer: WIMA
Product Category: Polypropylene Capacitors
RoHS: Details
Capacitance: 10 uF
Tolerance: 10 %
Voltage Rating: 250 Volts
Operating Temperature Range: - 55 C to + 100 C
Termination Style: Radial
Dimensions: 19 mm W x 41.5 mm L x 32 mm H
Product: Metallized Polypropylene Capacitors
Lead Spacing: 37.5 mm
-
4)DIODES
4 x 1N4148 D1,D2,D3,D4 MOUSER CODE -78-1N4148http://www.mouser.com/Search/ProductDetail.aspx?qs=TNTIDjy6APqozHdyHHFUGA%3d%3d
Product Category: Diodes (RF, Signal, Switching, Power)
RoHS: Details
Configuration: Single
Termination Style: Through Hole
Package / Case: DO-35
Reverse Voltage: 100 V
Forward Voltage: 1 V @ 0.01 A
Forward Continuous Current: 0.15 A
Max Surge Current: 2 A
Reverse Current IR: 0.025 uA
Recovery Time: 8 ns
Packaging: Reel
Product: Switching Diodes
PartsPerReel: 10000
-
5-TUBES:
www.tubedepot.com
DON'T HAVE NOS STOCK WITH THIS CODES
2 x 6BC8 V1,V2www.tubedepot.com NOS-6BC8

THEY OFFER REPLACEMENT WITH THIS CODE
2 x 5687 V3,V4www.tubedepot.com NOS-5687
THEY OFFER REPLACEMENT WITH THIS CODE

6-SOCKETS:
FOR NOW CODES CORRESPOND
4 x Noval Ceramic PCB 18mm V1,V2,V3,V4
www.tubedepot.com SK-9PINPC2
www.tube-town.net sk-9-18-PCB
-
TO BE CONTINUED..........