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BA-3 As Preamp
BA-3 As Preamp
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Old 10th October 2017, 04:53 PM   #1241
Zen Mod is offline Zen Mod  Serbia
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BA-3 As Preamp
wdecho , will you post exact schmtc of your BA3 FE specimen ?
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Old 10th October 2017, 05:04 PM   #1242
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ref. to enclosed sch

decrease R5 until you are satisfied with gain

68R there will give almost 3db of increase

51R will give almost 5db
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File Type: jpg BA3 FE.jpg (57.3 KB, 634 views)
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Old 10th October 2017, 05:14 PM   #1243
wdecho is offline wdecho  United States
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BA-3 As Preamp
Thanks Zen, will do. I thought that R5 is one of the resistors to change. Just a solder slingers guess.

This morning I installed another op-amp in my op-amp phono pre with 2 db more gain and the BA-3 has enough oomf with enough volume right now but it would be nice if I can use it with my J-fet phono pre as well. I think I will go with 68 ohms to start. Right now with a higher gain phono pre the sound has more authority with my F4. The F4 is one of, if not, my favorite amplifier among the 6 finished FW clones I have.

About to forget, same schematic used.
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Old 13th October 2017, 07:17 AM   #1244
AndrewT is offline AndrewT  Scotland
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Tack a temporary 220r in parallel with the existing 100r to get ~ 68r
and listen/measure.
Then change the temporary 220r to a 130r to get ~ 56r
These could be wired in with a dip switch to give switchable variations if you need that.
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Old 13th October 2017, 11:14 AM   #1245
wdecho is offline wdecho  United States
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BA-3 As Preamp
Many thanks guys.
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Old 4th December 2017, 05:42 PM   #1246
broennimannrainer is offline broennimannrainer
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I have built this preamp several years ago. Some uf of PPs in the output and was not so impressed.

Now I revived it. First finding: the nominations of P1 and P2 in the schematic are reversed. Had quite some fun.

With Silmics in the output the preamp is overly polite. With Nichicon FG, KZ and biplolars it is much more fun but still a bit recessed.

I changed the gain according to Zenmod and Andrew - and everything is fine now. Very open and dynamic.

Many thanks.
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Old 8th December 2017, 10:56 PM   #1247
dimkasta is offline dimkasta  Greece
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I really should be working right now, but I could not resist
Version b of my boards arrived after almost 2 months in customs. The crisis is now messing with our hobbies as well...

Anway...
They seem to bias up nicely, and the FQP pairs seem very close without any matching.

Here is some porn

BA-3 As Preamp-img_20171209_001340-jpg

BA-3 As Preamp-img_20171209_011021-jpg
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File Type: jpg IMG_20171209_011021.jpg (206.3 KB, 727 views)
File Type: jpg IMG_20171209_001340.jpg (160.4 KB, 711 views)
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Old 8th December 2017, 11:05 PM   #1248
Zen Mod is offline Zen Mod  Serbia
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intend any heatsinking on them ?
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Old 8th December 2017, 11:27 PM   #1249
dimkasta is offline dimkasta  Greece
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Yeah they are going on a 10mm aluminum bottom plate
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Old 7th April 2018, 12:06 AM   #1250
vdi_nenna is offline vdi_nenna  United States
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Anyone know how I can simulate the load the ba-3 preamp circuit has on the power supply? Can a resistor be used?

I have an AN-0512 Antek 12v-0 12v-0 secondary wired in series for 24v. Im getting odd reading with no load on the regulated power supply. The reg power supply manual says to use a load to get proper readings.
It's an LM317/LM337 based regulator.

I want to test the power supply before connecting it to the ba-3 preamp circuit. What value resistor, if any, can be used?

Thanks

Vince
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