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Old 8th February 2011, 05:34 PM   #171
AndrewT is offline AndrewT  Scotland
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insert a resistor in the power feed and measure the current.
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Old 8th February 2011, 05:55 PM   #172
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Default B1 current

will do,
thanks
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Old 8th February 2011, 06:14 PM   #173
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Quote:
Originally Posted by 6L6 View Post
Try the RCA first, and see how it sounds (I.E., hum) It there is a problem, then try on the pot.
thanks 6L6 i do that..

i tested the build the other day but i did not include the 1M resistor (i forgot it). It seemed to sound fine.. this was only using a mp3 player as a source.

So is the 1M necessary for all sources? Just curious i will be putting them in..
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Old 8th February 2011, 06:18 PM   #174
6L6 is offline 6L6  United States
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I think it's more of a ground loop breaker... I'm not entirely sure, actually.
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Old 8th February 2011, 08:25 PM   #175
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Default B1 current draw

Didn't check the current yet but did look at power source (pair of 9v batts)
18v off the batteries becomes 9v at the board power in location
???
Thanks
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Old 8th February 2011, 08:42 PM   #176
jleaman is offline jleaman  Belgium
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Some very nice looking stuff in here guys Keep it up!
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Old 9th February 2011, 06:43 PM   #177
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thought i would share a couple of pis of my build.

I decided to go point to point and integrate am mp3 player into the unit... not quite finished, i have to finish mounting the mp3 player and add the faceplate to it and the feet and knob are temporary for the pics also considering adding some leds to give it a glow but not sure yet..

Click the image to open in full size.
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Old 10th February 2011, 12:08 PM   #178
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Hi all,

I'm very interested in the B1 and F5 combo.

But before beginning would like to know if it can drive my naim SBL to satisfactory levels
their sensitivity is 89 and impedance 6 ohms
and I have a mid size space (6X7 meters)

thanks
IK
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Old 10th February 2011, 12:22 PM   #179
AndrewT is offline AndrewT  Scotland
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Hi,
the B1 & F5 have a gain of +15.5dB.
The signal level at the B1 input needs to be higher than usual. 3.5Vpk for maximum output. A CDP is normally capable of ~3Vpk at maximum.

The 27W into 8r0 becomes ~36W into 6r0.

This will give a maximum of ~100dB SPL at 2.5m from a pair of 89dB speakers.
In a 42 sqm room, I would not consider that sufficient.
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Last edited by AndrewT; 10th February 2011 at 12:25 PM.
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Old 10th February 2011, 03:28 PM   #180
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thanks for that Andrew T
What a disapointment !

So what would you recomend for a 1st time DIY? (an active pre?)

I would realy like to try using the F5 for amplification

IK
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