So I ordered ESA Claritycaps 10uf and there was a stocking issue, then a wait for a shipment from the U.K.... And I received CSA versions instead. Vendor shows no new stock of ESA's and they seem to be particularly scarce online in general.
Thoughts on CSA vs ESA claritycaps?
Finished building a balanced BA-3 a few weeks ago. It's a simple balanced in-blanced out. It feeds a pair of balanced f4 monoblocks which have served me very well for several years with a variety of pre-amps.
Some pictures are attached not so much to show off, just as proof!
I am very happy with the sound. Amazed actually.
I set P3 at the midpoints. But just for the challenge I tried to set up a computer/sound card to adjust them. Understand, I am way too much of a paint-by-numbers builder with no measuring expertise beyond DMMs.
I didn't get very far.
I tried to use half of one balanced channel, e.g. the + to ground, to the sound card but that doesn't seem right and has little output. But at least there would be a single P3 to adjust this way.
I then tried feeding the sound card with a single, full balanced channel. This gives a nice signal.
But I am wondering if this is the correct approach as I will have to adjust two P3s at the same time. And I already have repetitive stress from all the bias, offset adjusting.
I really can't thank everyone in this community enough. You are all just amazing.
Some pictures are attached not so much to show off, just as proof!
I am very happy with the sound. Amazed actually.
I set P3 at the midpoints. But just for the challenge I tried to set up a computer/sound card to adjust them. Understand, I am way too much of a paint-by-numbers builder with no measuring expertise beyond DMMs.
I didn't get very far.
I tried to use half of one balanced channel, e.g. the + to ground, to the sound card but that doesn't seem right and has little output. But at least there would be a single P3 to adjust this way.
I then tried feeding the sound card with a single, full balanced channel. This gives a nice signal.
But I am wondering if this is the correct approach as I will have to adjust two P3s at the same time. And I already have repetitive stress from all the bias, offset adjusting.
I really can't thank everyone in this community enough. You are all just amazing.
Attachments
it would be simple , with sound card having bal output and bal input
without that , you need something to jump few times between SE and Bal realms
so:
- card SE out - xformer for SE-Bal conversion - preamp in
-preamp out - xformer for Bal-SE conversion - card SE in
considering prices of decent xformers .... it's clever to think of cheapest external card with bal in/outs
without that , you need something to jump few times between SE and Bal realms
so:
- card SE out - xformer for SE-Bal conversion - preamp in
-preamp out - xformer for Bal-SE conversion - card SE in
considering prices of decent xformers .... it's clever to think of cheapest external card with bal in/outs
Is the cap output connected to the input of another component, i.e. an amplifier?
The cap needs a load, after the cap connect a 100k resistor to ground for measurement.
Gain of "Gain" Stage
Hi
I'm thinking of building an F6 (ordered the boards) and looking at using the BA-3 gain stage as the preamp. However, I have a Hagerman Cornet 2 as the phono preamp and based on the 44 dB gain of this unit and the output of my current cart, the phono only puts out about 0.9V, which I think is a bit low for the F-6. So I was wondering if anyone could tell me what the gain of the BA-3 gain stage is? Ideally a gain of at least 4-5 would cater for future carts with lower output and allow me to attenuate the input into the F-6 with a volume control.
Thanks in advance - these threads have been a great help.
Hi
I'm thinking of building an F6 (ordered the boards) and looking at using the BA-3 gain stage as the preamp. However, I have a Hagerman Cornet 2 as the phono preamp and based on the 44 dB gain of this unit and the output of my current cart, the phono only puts out about 0.9V, which I think is a bit low for the F-6. So I was wondering if anyone could tell me what the gain of the BA-3 gain stage is? Ideally a gain of at least 4-5 would cater for future carts with lower output and allow me to attenuate the input into the F-6 with a volume control.
Thanks in advance - these threads have been a great help.
Can this ebay seller be trusted? …..anybody knows him?
Toshiba 2SJ74 + 2SK170 LAB MATCHED OCTET to 0.03mA / 4mV (10mA range) | eBay
….also the BL grade should work in the BA-3 gain stage (without change in schematic)?
I got the Fairchild mosfets so I have got 1k trimmers for P1, P2.
Toshiba 2SJ74 + 2SK170 LAB MATCHED OCTET to 0.03mA / 4mV (10mA range) | eBay
….also the BL grade should work in the BA-3 gain stage (without change in schematic)?
I got the Fairchild mosfets so I have got 1k trimmers for P1, P2.
full analysis of circuit is in article , few Papa's re-type mistakes corrected later in comments
I have ordered an octet. He writes that they are in the 7 mA range.....should be OK I guess (hope)…….
That will be fine. Actually, Punkydawgs has better, more extensive testing of his FETs than other genuine sellers. Not that you need a perfect match in this circuit though.
article , here , if you want addendum
Burning Amplifier BA-3
addendum - -look down at comment #15 , by Mighty Moi :
Burning Amplifier BA-3
Burning Amplifier BA-3
addendum - -look down at comment #15 , by Mighty Moi :
Burning Amplifier BA-3