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Old 12th December 2016, 07:09 PM   #31
trean27 is offline trean27
diyAudio Member
Join Date: Jul 2014
Location: Norway
Elektor-Giant 1000W
i hope it is ok to join this thread.. this design is asking for 90volts at the input for the driver stage, I have 80volts from my transformer after recitifying and secondary line at 70volts for powerstage. I have problems to reconfigure the values of the zener, maybe zener D1 and D3, and maybe some resistors at the psu, anybody has a quick solution. ?
best regards Niklas.

Last edited by trean27; 12th December 2016 at 07:14 PM.
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Old 13th December 2016, 08:53 AM   #32
guidobullo is offline guidobullo  Italy
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Join Date: Jan 2016
Location: Chioggia
Smile elektor

lo ho realizzato con le specifiche di elektor.
90V sul'ingresso del 7808 e del 7908 ed anche i 72V richiesti secondari.
come diodi per formare gli 80V ho usato quelli che avevo cioè uno oppure due diodi che mi fornissero i 72 V richiesti, per il resto non ho modificato nulla.
lo ho usato per anni con molta soddisfazione, ora ho preso i 2SK135/2SJ50 e li ho pilotati con LME49830, praticamente ho realizzato lo schema della texas.
ora però devo affermare che non ne valeva la pena in quanto il suono e uguale all'ampli di elektor, ciò che rende quell'amplificatore straordinario sono i mosfet Hithaci.
voglio ricordare che senza adottare lo schema parziale dell'alimentazione della texas si nota un ronzio che non si toglie nemmeno con elettrolitici di ottima qualità, quindi lo devi adottare per forza, ripeto come ho già detto che nel crescendo avevo risolto tutti i suoi problemi stabilizzando a transistor l'alimentazione, usavo la coppia TIP142/147.
ripeto per gli 80V puoi usare qualunque conbinazione di zenner purchè la somma fornisca 72 V per il resto attieniti alle specifiche di elektor.
il sax sembra palpabile la voce è naturale e la dinamica, l'incisività che ti da alle frequenze basse e fantastica.
se posso esserti di aiuto non esistare a contattarmi.
I carried it with specific elektor.
90V sul'ingresso of 7808 and 7908 and also the required 72V secondary.
such as diodes to form 80V I used the ones I had that one or two diodes that would provide me the required 72 V, for the rest I have not changed anything.
I have used it for years with great satisfaction, now I have taken the 2SK135 / 2SJ50 and I have driven them LME49830, I have basically realized the scheme of texas.
But now I have to say that it was not worth it because the sound is equal to the amp of elektor, what makes it extraordinary that amplifier are the mosfet Hithaci.
I want to remember that without adopting the power of texas chart partition you notice a humming sound that would not take off with high quality electrolytic, so you have to take by force, I repeat as I have already said that in growing up I had solved all his problems by stabilizing transistor power, I used the TIP142 / 147 torque.
I repeat for 80V you can use any combination under Zenner provided the sum provides 72 V for the rest just follow the specifications of elektor.
sax seems palpable voice is natural and dynamic, the incisiveness that gives you at low frequencies and fantastic.
if I can help do not hesitate to contact me.
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Old 27th May 2019, 06:45 AM   #33
Diabolical Artificer is offline Diabolical Artificer  United Kingdom
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Join Date: May 2014
Location: UK
What is the sound at switch off, high pitched or a low thump? I'd connect it to a dummy load and scope the output, then do the same with speakers attached to see what's happening. It sounds like the amp is oscillating at SW off.

One thing to note, doubling up the capacitance in the PSU is in general not a good idea, it stresses the main tfmr, you have a lot more surge current, some heavy duty thermistors on the AC IP would help as would a slow start circuit.


Last edited by Diabolical Artificer; 27th May 2019 at 06:48 AM.
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