bluebird
Well-known member
Could the G9 stand a 1:1 / 600:600 output transformer instead of a 2:1 ?
would the output just be hotter?
would the output just be hotter?
G9 output
- Thread starter bluebird
- Start date
Help Support GroupDIY Audio Forum:
It's not a very good idea..
The G9 output is driven by an ECC82 SRPP stage, with a Zout of around 2400 Ohms.
So if you load it with a 1:1 transformer, your resulting output resistance will be 2K4 Ohms - a bit too high - and your output level would be 6dB higher.
But in order for this to work, you would need an output transformer that will work well (ie pass low frequencies) with a source Z of 2400 Ohms. These are not common at all.
The 2:1 output transformer ensures an output impedance of 600 Ohms, and I don't think that you'll need higher output levels than this delivers already.
But on the other hand, if you need more gain (e.g. using weak-output ribbon mikes) it would better to experiment with ECC81, 12AY7 or ECC83 for the first gain stage. They should be more or less plug-in compatible.
Jakob E.
The G9 output is driven by an ECC82 SRPP stage, with a Zout of around 2400 Ohms.
So if you load it with a 1:1 transformer, your resulting output resistance will be 2K4 Ohms - a bit too high - and your output level would be 6dB higher.
But in order for this to work, you would need an output transformer that will work well (ie pass low frequencies) with a source Z of 2400 Ohms. These are not common at all.
The 2:1 output transformer ensures an output impedance of 600 Ohms, and I don't think that you'll need higher output levels than this delivers already.
But on the other hand, if you need more gain (e.g. using weak-output ribbon mikes) it would better to experiment with ECC81, 12AY7 or ECC83 for the first gain stage. They should be more or less plug-in compatible.
Jakob E.
That would work - but the transformerbalancing is imho by far the most unproblematic interface standard..
Jakob E.
Jakob E.
dukasound
Well-known member
Does anyone can measured Gain position switch (in db)?
Stupid questions?
I would like to know what gain I have in any position (like on Neve and similar).
Duka
I need only three poly caps and I will start to soldering.
Stupid questions?
I would like to know what gain I have in any position (like on Neve and similar).
Duka
I need only three poly caps and I will start to soldering.
bluebird
Well-known member
Thanks Jackob.... :grin:
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