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Old 11th April 2013, 03:06 PM   #111
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Another question,
I would like to check again the values of C1/C2 and R17 and R27 .
I already placed the pcb in my aluminum chassis so,to which pins in the socket tubes should I be connected to measure the above ? (I have the feeling the power is not as I measured 3 weeks ago)
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Old 11th April 2013, 03:08 PM   #112
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Here are some pictures
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Old 11th April 2013, 05:05 PM   #113
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Quote:
Originally Posted by sagi4422 View Post
Hi.
Isn't the CFB switch in charge of inverting the polarity of the OPT's secondaries?
Note the "Note" on the schematic just above the feedback switch......

Simple SE schematic
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Old 11th April 2013, 06:04 PM   #114
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Yes I saw that,
With CFB, the UL is working. I didn't have the time to play with that much so until now I didnt find a different.Although that, I think the output power was decreased somehow after connecting the switches. Any chance to measure the DC voltage using the socket pins?
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Old 11th April 2013, 06:28 PM   #115
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The output power in triode mode will be a fair bit lower than UL.
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Old 11th April 2013, 06:29 PM   #116
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Quote:
Any chance to measure the DC voltage using the socket pins?
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Old 11th April 2013, 07:16 PM   #117
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Do you want to measure B+ voltage? Pin 3 to ground.

Here are the pinouts:

TDSL Tube data [EL34]
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Old 11th April 2013, 08:08 PM   #118
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OK.
This is my measurements now :
PIN2 - GRN - 31V
PIN3 - GRN - 0V
PIN5 - GRN - 497V
PIN6 - GRN - 497V
PIN7 - GRN - 31V

As indicated here, pin3 and ground gives 0V.
According to the first experiments I did, before I put it on the chassis, I have 3V less now. ?!
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Old 11th April 2013, 08:22 PM   #119
rknize is offline rknize  United States
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I suspect that you counted the pins backwards and inadvertently tested pin 6 instead of 5:

2 - 31V
3 - 497V
4 - 497V
6 - 0V
7 - 31V

Pin 6 has no connection on EL34. You probably want to check pin 8, too.
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Old 12th April 2013, 06:53 PM   #120
PDL is online now PDL  United States
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The 3V difference could easily caused by your mains voltage fluctuating. I've seen my mains vary as much 3V, if not more in the summer when everyone cranks the AC.
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