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Old 2nd April 2003, 10:41 PM   #31
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Default GOERTZ BRIDGE??

Hi,

Quote:
Do U had experience that use non- CT winding transformer that mix with diode(IN4007) & tube(5U4) to rectifiy in 300B amp.
If it is what I think it is than the diodes ( the silicon ones) would still benefit from snubbers.
To me, the main beauty is that it provides a slowstart as well.

Hi James,

Are you sure this is what it is called? It's not a Graetz bridge, but a Goertz bridge?

Cheers,
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Old 3rd April 2003, 01:08 AM   #32
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Default RF noise from solid state rectifiers

If the noise occurs at or about 100Khz, the filter choke will take it down more so than the power supply ripple. The inductive reactance, of a 10 henry choke @ 100Khz is +j. 6,200,000. If a 100 Khz component appears on a DC supply, it is poorly designed.
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Old 3rd April 2003, 01:14 AM   #33
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Default RE:RF noise from solid state rectifiers

Hi,

RTFM, or in other words pls. read what's said in the link I provided.

No choke is going to kill it off effectively, this is a MHz thang.

Snubb it and see,
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Old 3rd April 2003, 01:44 AM   #34
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Default RF noise from solid state rectifiers

The higher up in frequency the spurious component is, the easier it is to filter. If the component is in the Mhz range a mica bypass capacitor would take it out. A .01MFD capacitor is a -j. 13
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Old 3rd April 2003, 01:52 AM   #35
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Default IT AIN'T THAT SIMPLE.

Hi,

Quote:
If the component is in the Mhz range a mica bypass capacitor would take it out. A .01MFD capacitor is a -j. 13
And no, that won't be all that effective...

Once again read the info given by Fred Dieckman, digest it and just like me, you'll realise that audio is a big jungle,

A scope is a really handy tool, not a luxury.

Ciao,
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Old 3rd April 2003, 02:07 AM   #36
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Default CROs

I have one. A 100Mhz dual trace. I have never seen what you are talking about.

There is no other way to look at ripple components.

I have a complete audio test facility
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Old 3rd April 2003, 04:55 AM   #37
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hi frank,

is the diodes ( the silicon ones) would provides a slowstart as well as the 5U4G.
The tubes need time to warm up the filament. Is still faster than the diode??

thanks

Thomas
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Old 3rd April 2003, 05:56 AM   #38
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Default ...poor spullen...

Hi Frank,

Frank said

Quote:
Are you sure this is what it is called? It's not a Graetz bridge, but a Goertz bridge?
You are 100% right! Sorry. I'm dyslexic - so this sort of mis-spelling is very common with me

You should see my attempts at learn a new language

I agree with the diodes still benefiting from snubbers in a Graetz bridge - that has been my experience with 1N4007.

Valveluver

Actually a 100Mhz scope won't capture most of this RF noise by just hooking it accross the psu rails... The noise is burst in nature and (relative to the B+) low level. It can be done using a 'B delayed' set up but it is still very difficult to sync the B delayed with the reverse recovery spike.

But then if you have 'a complete audio test facility' you have a 1GHz bandwidth spectrum analyser with 80dB range and this will show this noise very very clearly - you can then see how ineffective your suggestions at filtering these components out will be.... ( I wish they did work!!!)

ciao

James
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Old 3rd April 2003, 09:13 AM   #39
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Default BETTER THAN NOTHING...

Hi,

To give you some idea of the (lack of) effectiveness of a snubber here's a screenshot of a scope.
This is the nasty **** going on next to the snubber capacitor. The vertical voltage scale is 50 mV/div. Notice the sharp spikes of HF, almost 150 mVpk.

The diodes are your everyday IN4007s, byspassed with a 1nF cap and a 150R in series.

Cheers,
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File Type: jpg nearsnub_small.jpg (1.3 KB, 390 views)
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Old 3rd April 2003, 09:16 AM   #40
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Default Same Supply But Schottky'd

Hi,

To give you some idea about the smoothness of the Schottky diodes:

Cheers,
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