Nice!... Can I frame that pic? ... I could swear I just saw something hanging from the ceiling in the local museum that looked similar...Output bias tested, at room temp starts at 220 mA, 5 W dissipation (without heatsinks) heats the outputs to 90 deg at stable 240 mA bias. Looks promissing without the need of any tempco regulation.
Jeje, unintended but more details on VSSA case are allways nice
If you're a Bruno fan LOL this is an interesting project:
Grimm Audio
If you're a Bruno fan LOL this is an interesting project:
Grimm Audio
Output bias tested, at room temp starts at 220 mA, 5 W dissipation (without heatsinks) heats the outputs to 90 deg at stable 240 mA bias. Looks promissing without the need of any tempco regulation.
Nice! New amp coming out soon...
The amps was singing yesterday night with 4 ohms KEF speakers.
The background noise is very clean even stick to speakers hard to hear and seperation is very good with 2 smps. Overall sound is warm, details and musical. Soundstage is still tight especially on the high. I think this will be improved after more burn in. Thanks LC for this amp.
James
An externally hosted image should be here but it was not working when we last tested it.
The background noise is very clean even stick to speakers hard to hear and seperation is very good with 2 smps. Overall sound is warm, details and musical. Soundstage is still tight especially on the high. I think this will be improved after more burn in. Thanks LC for this amp.
James
The amps was singing yesterday night with 4 ohms KEF speakers.
An externally hosted image should be here but it was not working when we last tested it.
The background noise is very clean even stick to speakers hard to hear and seperation is very good with 2 smps. Overall sound is warm, details and musical. Soundstage is still tight especially on the high. I think this will be improved after more burn in. Thanks LC for this amp.
James
Congratulations James
You're one of the first complete VSSA builders, very nice case and as recommended with SMPS PSU. Yes, burn in period is funny since different elcos act very differently soundwise. All I can say enjoy in music.
This VSSA official case is made out of the best Aluminum material possibly find around here because of the final brushing finish. All plates are fine brushed so the material needs to be very homogeneous. Plates thickness is 5 mm, they're pre-drilled with threads where needed and the case is adjusted to zero gap, plates tightly touches each other.
Regarding SQ (sound quality) I can tell that it is much better than my demo wooden "case" since the grounding is perfect so the lowest level signals are not lost in any kind of noise. No interferences from outside, all Aluminium material meaning no amplified magnetic fields formed in plate material.
Darn! Where can I get one of these cases?!
Nice one James! Congratulations for your success!
Is that a custom case?
Thanks metallicus69!
The case I order from China Taobao website through local agent.
Congratulations James
You're one of the first complete VSSA builders, very nice case and as recommended with SMPS PSU. Yes, burn in period is funny since different elcos act very differently soundwise. All I can say enjoy in music.
Thanks LC for your kind words! This is the amp let me start to enjoy in music ...
James,
Is it only me or do I see a electrolytic capacitor (green in colour) in place of film cap?
Edit: ok, my bad. It is 2200uF, 6.3V cap. I see the film cap now.
Thanks
Yes, it is Matsushita 2200uF electrolytic cap.
Cheers,
James
One channel is not stable There was a noise in the speaker and I measured 0,5V DC on it. When I checked the channel it sometimes got 0,5V DC on the output (and correct input bias) and sometimes switched to 0mV on output and no input bias between TP1 and TP2 On second TPs there were about twice the input bias then. When it's 0,5V DC then both biases are ok. Gonna replace one VAS and see what's happening...
@Junie: Beautiful chassis!
Thank you, it's from Aliexpress.
Hi BrianI intend using 200mm with 40mm fins (includes 9mm back- plate. Fins are well tapered and corrugated. What do you suggest is a safe minimum height. (I have 200mm each available, but can cut down. The box will be from 7mm alloy panels)
Look for your's heatsink efficiency data of °K/W at height of 100 mm. Than calculate the height according to desired 0,5°K/W end result.
Is a soft start advisable with Hypex dual mono PS?
NTC on each SMPS400A180 PCB has to be shorted. Than connect them according Soft Start schematic.
Sequence starts by powering the switch, inrush current controled by CL90 NTC, after 2,5 s relay shorts the NTC enabling live phase direct connection to both SMPS-s.
Attachments
Change R19, R20 10 Ohm resistors as instructed in post #1853. Check the voltage drops as suggested in post #1860.VAS is ok... still the same problem
Compare working channel to problematic one and try to find clues.
Front panel is done.
Junie, very professional looking front plate.
Is front panel pushbutton on/off function working without errors now? No undefined changing state?
Is SQ OK with Wharfedale speakers?
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