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Old 17th December 2009, 04:20 PM   #21
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by Zen Mod View Post
well ...... I made some comparisons between commercial made AVCs , TVCs and PSM lightspeed .

all I can say is - to each his own . differences are matter of taste .

xformers have own virtues , PSM LS is brutal in resolution and transparency , but I can't say that one is better than other .

matter of taste .
Good, And well put Zen, , now guys He is pretty right, its just a matter of what one likes. No need to start a argument. We had enough of that in the cable thread, ( soon to be closed )

It all has to do with personal taste, and to some ( YES SOME ) who has spent more money.

I'm still running my alps 20$ pot i bought from peter 4 years ago, passivly between my Sony CDP-620es cdplayer and my Mini aleph's.

that's right a 20$ Alps pot, ( thanks peter )
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Old 17th December 2009, 04:23 PM   #22
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Resolution and transparency come from a source, if those are lacking, you can't afford to loose any of it in subsequent stages. That may explain some of the preferences
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Old 17th December 2009, 06:38 PM   #23
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speaking of that ... my 4-deck 10Klog TKD simply sucks , comparing to xformer and light volume .

every possible buffer suspension tried ....... naah .......
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Old 17th December 2009, 08:34 PM   #24
cbdb is offline cbdb  Canada
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Quote:
offering 6dB gain, high input impedance and low output impedance,
??

Its a transformer so the input impedance depends on the input of the next stage, and the output on the source impedance, and with 6db gain the input impedance drops to 1/4 the amp input impedance which might overload the source. (this is worst case, without the schematic its hard to say what the attenuater is doing). And with no buffering any noise on the output of the pre will get back to its input.

Last edited by cbdb; 17th December 2009 at 08:55 PM.
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Old 17th December 2009, 08:39 PM   #25
cbdb is offline cbdb  Canada
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Who needs gain? Well, whoever uses amps with low gain or low efficiency speakers
The speakers arent part of the equation, its just about the amp sensitivity. (what Vin causes full output power.)
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Old 17th December 2009, 08:55 PM   #26
cbdb is offline cbdb  Canada
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£7,500 is irrelevant here, those transformers cost approx $500 directly from a source
Wish I could say $10,000 was irrelevant!

Minimal design (high school physics), 2 $500 xformers, 3 selector switches, a chassis some wire and some connectors= about $1500. Lets say the dealer takes $4k, thats about $4500 profit per! ( Im not including marketing or the graft paid to the reviewer but come on somethings not right with these numbers)
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Old 17th December 2009, 09:12 PM   #27
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Quote:
Originally Posted by cbdb View Post
??

Its a transformer so the input impedance depends on the input of the next stage, and the output on the source impedance, and with 6db gain the input impedance drops to 1/4 the amp input impedance which might overload the source. (this is worst case, without the schematic its hard to say what the attenuater is doing). And with no buffering any noise on the output of the pre will get back to its input.
Check this link for more info: Stevens & Billington Limited Audio transformers TX-102
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Old 17th December 2009, 09:14 PM   #28
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Quote:
Originally Posted by cbdb View Post
The speakers arent part of the equation, its just about the amp sensitivity. (what Vin causes full output power.)
They still are, as the max output volume level will ultimately depend on speaker efficiency for a given amp.
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Last edited by Peter Daniel; 17th December 2009 at 09:16 PM.
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Old 17th December 2009, 09:19 PM   #29
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Quote:
Originally Posted by cbdb View Post
Wish I could say $10,000 was irrelevant!

Minimal design (high school physics), 2 $500 xformers, 3 selector switches, a chassis some wire and some connectors= about $1500. Lets say the dealer takes $4k, thats about $4500 profit per! ( Im not including marketing or the graft paid to the reviewer but come on somethings not right with these numbers)
Don't blame me, mine were much cheaper

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Old 17th December 2009, 09:31 PM   #30
cbdb is offline cbdb  Canada
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Ok, didnt know the attenuation was done by xformer taps. Still: "In the case of operation with 6dB of gain and with 10kOhm load on the output the worst-case load impedance on the source will be 2500 Ohm plus copper losses. This is a very severe loading and many items of consumer electronic will not be able to drive such a load adequately! "
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