Salas hotrodded blue DCB1 build - Page 220 - diyAudio
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Old 5th September 2012, 04:06 PM   #2191
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Originally Posted by sorue View Post
I didn't have any experience with those 2 attenuators you linked. I tried the other popular ebay dact clone. Then i decided to upgrade to the TKD 2511 (bought from percyaudio). The TKD is more expensive but it is MUCH better than those ebay attenuators and well worth the price. I think the DCB1 deserves a proper attenuator.
This is a nice one - a 41-step series attenuator made with SMD resistors. A little pricey, though. The pictures on the site are old - it now has a steel enclosure.
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Old 5th September 2012, 06:43 PM   #2192
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unfortunately, the ladder attenuator is 100K only
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Old 5th September 2012, 06:47 PM   #2193
AndrewT is offline AndrewT  Scotland
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Buy the switch and the resistors and assemble them yourself.
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Old 6th September 2012, 09:28 AM   #2194
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Originally Posted by mike_mcf View Post
A 23 step usually allows for 3dB adjustments where a ladder array can get you to 0.5dB.
got the point! thanks! then the 2nd one I remove from the list of candidates.

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Originally Posted by sorue View Post
The TKD is more expensive but it is MUCH better than those ebay attenuators and well worth the price. I think the DCB1 deserves a proper attenuator.
Indeed this one is quite expensive. Moreover, it is said here that step attenuator could be even better, though TKD is superior than Alps which is 10(!) times less pricy... I have the blue one in my other opamp preamp, so would have a chance to compare if I go for a ladder type one.

Perhaps the ultimate LDR would be less expensive to build than TKD and sonically even a step over?! At least I would like to think in this way

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Originally Posted by schubert View Post
This is a nice one - a 41-step series attenuator made with SMD resistors. A little pricey, though. The pictures on the site are old - it now has a steel enclosure.
Looks very beautiful

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Buy the switch and the resistors and assemble them yourself.
too much of a hassle that would be. I'd rather go for LDR. I didn't put it in the list of the pots initially, however to gain the max performance from hot rodded up to 1.5A DCB1 I think I have to consider it along with proper toroid and careful BLs matching...
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Old 6th September 2012, 10:18 AM   #2195
AndrewT is offline AndrewT  Scotland
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George reckons the Lightspeed should be used without buffers for best performance.
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Old 15th September 2012, 06:18 PM   #2196
Marra is offline Marra  United Kingdom
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I have rehoused my DCB1 and have the following voltage readings :-
+- 9.4V at the output of thr regulator section and -1.5mv and -4.5mv at the buffer output.Are the offsets ok? tia.
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Old 15th September 2012, 06:21 PM   #2197
Salas is offline Salas  Greece
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-1.5mA is very good, -4.5mA just OK.
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Old 15th September 2012, 06:31 PM   #2198
Marra is offline Marra  United Kingdom
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Thanks Salas;no need for output caps then?
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Old 15th September 2012, 06:33 PM   #2199
Salas is offline Salas  Greece
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What kind of amp? What is its voltage gain in dB, is it DC input?
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Old 15th September 2012, 07:28 PM   #2200
Marra is offline Marra  United Kingdom
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Generally either an F5 with 15db or an Aleph 5 with 20db although I'm currently using a Gainclone the gain of which I have no idea.None of them have input capacitors.
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