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Old 24th March 2010, 12:42 PM   #1201
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Salas View Post
Maybe the single ended valve amp creates the sense of bass volume by loose damping factor on the big speaker? Its low impedance too.
yes, tuning of a ported speaker is critically dependant on the source impedance it sees.
This can be from long/short cables and/or thin/thick cables and/or low damping/high damping factor.

Very short cables and high damping factor will sound very different from long cables and low damping factor.
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Old 24th March 2010, 01:03 PM   #1202
Salas is offline Salas  Greece
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Its not a simple speaker. Many things could be creating synergy or not, indeed.
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Old 24th March 2010, 05:27 PM   #1203
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Thanks Salas for the schematic.
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Old 24th March 2010, 06:16 PM   #1204
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Salas, have you been thinking in placing bypass capacitors right next to the transistors of the preamplifier section? I mean the 4x 2SK170. Would it bring any noticeable difference?

I haven't seen it in too much in discrete desings, only in opamps, where they are neccesary. I suppose you will have an explanation for that if you don't put them.
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Old 24th March 2010, 06:44 PM   #1205
Salas is offline Salas  Greece
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You mean small decoupling caps like in op amps psu pins? Not necessary here. Works smoothly as is.
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Old 24th March 2010, 07:37 PM   #1206
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Ok, I suppose it sound as good as it should. Thanks for your fast reply
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Old 25th March 2010, 02:10 AM   #1207
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Originally Posted by regiregi22 View Post
That's the only thing I am afraid about, the switch contacts. My last rotary switch I bought from ebay fails from time to time. In some positions, you only have sound in one channel, you have to move it a bit to have a good engadgement.
But is not really a concern, it happens only once for every 20 or 30 times I move the switch. And for the price, you can't beat it. An stereo 23 steps switch for 10$, shipping included. I have mine mounted with Dale's and sound wonderful.

dantwomey, I really like your approach. But as you don't need the pots to be good ones, you can use some cheapers. I may do something as you if I is possible to find cheaper motor controlled pots.
Here is a remote control Remote Control DIY kit PCB that is recommended on the very first page of this LightSpeed Attentuator. One caveat though, I have not read the Lightspeed thread so there may be a better solution enclosed.

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Dan
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Old 25th March 2010, 02:49 AM   #1208
udailey is online now udailey  United States
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Maximus has a remote for the Lightspeed. He is on the Lightspeed thread so if you question he will answer. It does not source select, but it does volume and left to right balance and he is a very good power supply designer so I am betting it sounds very good.
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Old 25th March 2010, 07:49 AM   #1209
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Hi.I found takamishawa A12W-K 114 relay and 5v omron g6H-2 118 5v relay(could not find 12v)
Does takamishawa suits B1 buffer?Is it better or worse than omron?Thank you
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Old 25th March 2010, 09:14 AM   #1210
khaho is offline khaho  Finland
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Takamishawa A12W-K works in my DCB1, but I cannot say if it is worse than Omron.
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