Hi thanks for the kind and helpful advice I tend to like simpler designs With less parts i mean The minum to get a decent and stable result.
I am very bad at doing things ... i can just assemble kits and modules A mistake is around the corner.
Yes there are many kits working with half that 116 Volt One thing i have learned clearly For small power better to use smaller raill voltages
This is very very important for me to know
I was thinking to get a dual voltage from those 116V .... it would be perfect But i do not know if this transformer is center tapped or there are two separate secondaries connected on one wire to get the 0 To get a dual voltage from each secondary would be perfect
I am sorry but i dont understand what you are suggesting 😕
i may be out to lunch on this one and would like to hear from others as to the reason that this amp failed because of where the bias transistors where located on the heatsink or is that just me ....
https://www.diyaudio.com/community/attachments/noiz-hercules-180-jpg.1046465/
https://www.diyaudio.com/community/attachments/noiz-hercules-180-jpg.1046465/
hi the previous owner told me that he opened and cleaned it from dust
at the power up it smoked badly from one channel and i can see some parts roasted
in the meantime and with all you great help i have decided to keep only the chassis for future kits
as i said i have finally understood that the higher the rail voltages the higher the risks
i just need some 20 or 30 W of power but with good tolerance of low impedance
a +/- 30 VDC should be enough for me
Of course i also understand that when high power is needed also high rail voltages are a must
About class A it needs big heat sink so this one is undersized I will stay with class AB
I will search in the forum for low power good sound projects
For sure I will answer to all the post above this
I am finishing my damned relocation to a new place and it makes me mad
Thank you All so much for now
gino
Hi its me again. This is what i meant for simpler project. And you say that you like the sound ? i am a little esitant about a cap at the output
I read some criticism. Like for transformer couple amps
Thanks a lot again. I think i will keep only the chassis in the end. This transformer is not the best option for what i have in mind That is a small power amp
Even only power amp. Because i have plan for a line preamp in the future. I need just few clean watts
I was looking at the Nelson Pass projects but they are all class A and need big heath sink
I find the Honeybadger too complex for a first project Too many parts I was thinking to something like this ...
https://www.diyaudio.com/community/threads/thoughts-on-the-velleman-k8060.180220/
but then i read very bad opinions in the forum
Very nice amps and big too As i dont need much power 3 output pairs for channel seem too many After all this amp was able to output big power with just a pair of bjts per side All the high power amps i have seen in the web have rows of many bjts or mosfets I think they have designed it badly
Yes ! unfortunately the outputs is too high ... i will keep the chassis It is already something They do not come cheap and there is also some heat sink
Unfortunately i cannot use the two secondaries separated It is a V-0-V type It is quite big actually I do not think it is broken
I find at 1/8 to 70 watts, AX6 sounds the same on SP2-XT speakers as Peavey CS800s rated at .03% HD (harmonic distortion) @ 240 w/ch. No capacitors in sound path of CS800s with XLR input. Speaker capacitor causes phase shift, but much less effect than the walls floors & furniture in your room.
I think people that claim they can hear difference between .2% HD and .0003% HD on speakers are hallucinating. Speakers produce .5% to 20% HD. I have a pair of speakers now that are rated 2nd & 3rd harmonic distortion 20 db down from sound @ 5 w. SP2(2004) . Speakers is where I spend my money, not the amp. The amp chassis was $50, the parts to build AX6 about $40. I built AX6 point to point on NemaCE 1/16" board (garolite). I use 1/4" air tubing as stand offs around #6 screws. Only about 70 wires, 6 transistors, very simple amp. AX6 responds well to regulated power supply rail, which my amp chassis (dynakit ST120) came with.
Having $300 (used) speakers is one reason I am passionate about speaker protection against DC. I've blown 2 speakers in the past, one of $240 a pair LWEIII (1974) and one of $200 a pair KLH23 (1978). That was with a transformer coupled vacuum tube amp.
I have some transformer coupled amps too, MMA-875t. Bass rolls off 3 db below 50 hz but I can't hear much difference on those either. HD <.5%. 75 w monaural. Cheaper than dirt, got one for $20 +$26 freight. Working.
You can use the transformer to drive 0-42 for many chip amps, even 1875 and maybe 3886. Use each side 0-42 per channel.
Transformers are expensive, and obtaining chassis and heat sinks is also a headache.
I suggest you check out the transformer with a meter for impedance and leakage to body, and keep the whole thing in storage.
If it is good, you do get kits (populated PCBs) to wire in and use.
The mounting and connection is all you need to do.
Transformers are expensive, and obtaining chassis and heat sinks is also a headache.
I suggest you check out the transformer with a meter for impedance and leakage to body, and keep the whole thing in storage.
If it is good, you do get kits (populated PCBs) to wire in and use.
The mounting and connection is all you need to do.
I think we need to understand what the OP needs. It may not even be necessary to bloat the request to an oversized monster amp, just to make use of the inappropriate transformer. He can do what he really wants with no more than a little 25/25V 120VA toroid or conventional 48V CT transformer here so let's not suggest designs powerful enough to wake the neighbours a half kilometre away.
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