He told me he really loves it. If he buy's more modules, I might too and we can ship like last time.
Ciao!
Do
The heat sinks used are 240x100x30mm with a 5mm base thickness. It's taking a bias measurement 18mA @ 55*C. The 5mm base is causing a substancial hotspot nearest to the fet. I would call this a Minimum recommendation.
The DPS-400 is a great power supply, the combination turns on and off quietly with 115db/w Compression Drivers with the DC offset only drifting about 2ma during power cycle. I believe that only one DPS-400 is required to build a great stereo amp with a peak output rating of over 14amps.
This is one of the quietest amps Iv'e used to date, and yet I still need to rewire the DPS-400/S2 LV to the manufacturers spec. By connect speaker ground direct to DPS400 and star grounding with thermistor isolation. This should make it silent.
I am extremely happy with everything so far, It sounds wonderful. I don't think Ill be changing anything until someone persuades me to turn up the bias.
I am now on the hunt to find a First Watt F5 owner to do a comparison. Their 50lbs+, 400mA+ goliath vs the 10lbs, 18mA sweet heart. Should be fun!
:radar
The DPS-400 is a great power supply, the combination turns on and off quietly with 115db/w Compression Drivers with the DC offset only drifting about 2ma during power cycle. I believe that only one DPS-400 is required to build a great stereo amp with a peak output rating of over 14amps.
This is one of the quietest amps Iv'e used to date, and yet I still need to rewire the DPS-400/S2 LV to the manufacturers spec. By connect speaker ground direct to DPS400 and star grounding with thermistor isolation. This should make it silent.
I am extremely happy with everything so far, It sounds wonderful. I don't think Ill be changing anything until someone persuades me to turn up the bias.
I am now on the hunt to find a First Watt F5 owner to do a comparison. Their 50lbs+, 400mA+ goliath vs the 10lbs, 18mA sweet heart. Should be fun!
:radar
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An externally hosted image should be here but it was not working when we last tested it.
Our new toroid is arrived. [emoji3]
500va 25vac.
It is only 65mm high, and a diameter of 170mm
Pers AMP will get the first two.
But unfortunately the toroid Got a bit more expensive than expected.
They cost 104€[emoji19]
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It is the heaviest 500VA toroid i have got until now. 5.8Kg. That is at least 1 kg more than a fully potted Nuvotem Talema
Case is from EBay. Gonna add a custom top and engraving on the front. PSU is TeaBag' boards with 88mF per rail. Transformer is a 400VA Antek. Bias will be set to maximum allowed by heatsinks. If it all goes as expected, I'll be putting heat on Sonny to finish higher power v4. I considered adding output pairs to these boards with a an adapter board, but after hearing of the V4, I decided to wait.
Buzzforb said:
Me too, buzzforb, me too
Sonnya is preparing / going to build a killer version for me with the new torroid trafo - and a nice looking cabinet (a huge understatement) This TSSA 1.7 poweramp (stereo version with one trafo, 1-2 capbanks and 2 TSSA 1.7 modules) is going to be my first - and the core component - in a new setup. Hopefully health will allow me to be able to enjoy it...Happy New Year to all of you.
Per
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There is a new version of the TSSA V1.7 on its way. But any one can easily upgrade there V1.7 by adding the capacitor mentioned below.
Basicly we have moved the trimmer to get space for larger trimmers with more "turns".
And we have added a capacitor of 470p 100V NP0/C0G between Drain and Source of U2 (EZW20N20) it removed some low level high frequence oscillation. This high frequency oscillation i have only seen on some amp. But add it just to be safe... IT will not kill the amp though..
I have a part number for this capacitor: SR151A471JAR
The legs should be as short as possible ~3 - 5mm.
It can be purchased at Farnell, Digikey, Mouser.
From RS-Online it is : SR151A471JTR (2.5mm wide instead of 5mm)
But any 470pF 5% >100VDC C0G/NP0 capacitor can be used ... also SMT 1206 case...
Film capacitor is not a good choice here because of the oscillation frequency of >10MHz.
Best regards
Sonny
Basicly we have moved the trimmer to get space for larger trimmers with more "turns".
And we have added a capacitor of 470p 100V NP0/C0G between Drain and Source of U2 (EZW20N20) it removed some low level high frequence oscillation. This high frequency oscillation i have only seen on some amp. But add it just to be safe... IT will not kill the amp though..
I have a part number for this capacitor: SR151A471JAR
The legs should be as short as possible ~3 - 5mm.
It can be purchased at Farnell, Digikey, Mouser.
From RS-Online it is : SR151A471JTR (2.5mm wide instead of 5mm)
But any 470pF 5% >100VDC C0G/NP0 capacitor can be used ... also SMT 1206 case...
Film capacitor is not a good choice here because of the oscillation frequency of >10MHz.
Best regards
Sonny
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An externally hosted image should be here but it was not working when we last tested it.
New AMP power test fault !!!
But i did Solve an todo before doing the full power test.
So the new AMPs will have build In protection circuit [emoji1][emoji1][emoji1]
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