HerbertR said:I also have nearly finished my Dual LA2A with Edcors WSM's and all recommanded Tubes,
Ah, good informations.BerndVP said:I have an excel with all parts I bought for this project here in EU.
Just my tubes I bought from Tube Depot, because they where the only ones giving the option for Matched tubes, and because it's an Stereo unit, I went for that .
BerndVP said:I would go for option 1
Does it make a difference (for a toroid power transformer) if the inner or the outer taps are connected together for 230V operation in the primary?
[silent:arts] said:Addendum:
I thought we are talking about gain at 10 o'clock, Bernd was talking about 10 at a scale from 0 - 100.
It turned out Bernd used a lin pot instead of a log pot.
andow said:I just finished the first of two D-LA2As and oh boy, does it sound wonderful! 8)
There is only one thing that is puzzling me: I am using two "AL29WF type db Meters" from frontpanels.de (they're not in the shop anymore so I can't post a link) and they don't seem to work as expected:
In GR mode I can't zero the meters, the needle won't go higher than -3dB.
In output mode the meter doesn't react at all, it's just wiggling if I turn the gain potentiometer.
I tried connecting the Sifam meter I plan to use in my second D-LA2A and everything works just fine, so the problem are definitely the meters.
Any idea what I could try to make them work?
andow said:Ok, so answering part of my own question here: the only thing that this meter from frontpanels.de has in common with an AL29WF is the size! :
There is NO RECTIFIER in the meter, and obviously that's the reason it doesn't react to AC.
Regarding the needle not reaching 0 in GR: I have a 62V Zener in place of the neon bulb, would it make sense to add a 10V Zener in series to raise the voltage?
ToBSn said:Hey andow,
just search for half wave rectifier or full wave rectifier.
Schottky or germanium diodes often used in this case to lower the overall voltage drop.
andow said:I just finished the first of two D-LA2As and oh boy, does it sound wonderful! 8)
There is only one thing that is puzzling me: I am using two "AL29WF type db Meters" from frontpanels.de (they're not in the shop anymore so I can't post a link) and they don't seem to work as expected:
In GR mode I can't zero the meters, the needle won't go higher than -3dB.
In output mode the meter doesn't react at all, it's just wiggling if I turn the gain potentiometer.
I tried connecting the Sifam meter I plan to use in my second D-LA2A and everything works just fine, so the problem are definitely the meters.
Any idea what I could try to make them work?
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