Mr. MR
will send you one of these , I have in OPLDF
lucky for you , just front plate scratched , so rejected ...... and it survived strictly because I'm waiting for new crusher machine
🙂
will send you one of these , I have in OPLDF
lucky for you , just front plate scratched , so rejected ...... and it survived strictly because I'm waiting for new crusher machine
🙂
Hi Mike,
I've already reviewed certain ergonomics aspect of the amp. Specifically, that I
can lift it up without injury, that it fits nicely on a TV stand, and it can also serve
as an antenna stand.
Please write about its sonics when the sample from OPLDF arrives.
Dennis
🙂
I've already reviewed certain ergonomics aspect of the amp. Specifically, that I
can lift it up without injury, that it fits nicely on a TV stand, and it can also serve
as an antenna stand.
Please write about its sonics when the sample from OPLDF arrives.
Dennis
🙂
I recommend that we all toss cash in a pot, buy one...
then ship it to ME for reverse engineering.
no?
then ship it to ME for reverse engineering.
no?
The most interesting comment in the article is Nelson’s around the bias circuit —
“The bias circuit that we are using interprets continuous high-power, high-frequency tones as a fault. If you want to do high-power, high-frequency IM test tones, you will need to do them quickly or you will get falsely high readings.”
“The bias circuit that we are using interprets continuous high-power, high-frequency tones as a fault. If you want to do high-power, high-frequency IM test tones, you will need to do them quickly or you will get falsely high readings.”
Papa set 10A through outputs , as level for protection to kick in
everything under that is delivered (obviously ) with welder attitude
everything under that is delivered (obviously ) with welder attitude
Historically, high power high frequency test tones are indicative of a major
fault. I simply exploited the difference between rise and fall times of the
sensing circuits to cut off the bias under those conditions.
...or...you are driving a not-very-efficient ribbon tweeter with lots of current and somebody used the "more cowbell" button on the recording.
I think it's safe to say that you are not the target customer for this amplifier.
😀
Guilty as charged.
That said, if the X25 power rails were in the +/- 5v to +/- 10v realm with unlimited peak power and vanishingly low output resistance, I would be tempted. That is what I am working on in the F4 Beast thread.
Not for me....
I do still not understand what the two 100uF and 10k and so on and the new 8leg critter are doing.
:--))
But it is always nice to have exciting riddles to solve .....!
I do still not understand what the two 100uF and 10k and so on and the new 8leg critter are doing.
:--))
But it is always nice to have exciting riddles to solve .....!
Papa puts his pants on just like everyone else: one leg at a time. Except, when he puts his pants on, he makes amplifiers!
If you mean the 8 leg critters on the output board, I think those are the TL431. They come in an 8 PDIP and a 3 leg TO92.
After nearly 10 years of following DIYAudio and buying SemiSouth output devices, I had to face that I don't have time to get out the soldering iron. I built my first audio amplifier in 1970. Getting older so I cheated. I invested in a Bryston BCD-3 connected to Pass HPA-1/XA25 connected to Aerial 7s. Stunning. In the coming months I will be auditioning Devore speakers but my old Aerials sound great. The reviews have been written and I can't say more about the sound than what has already been written.
What I can comment upon is my visceral response. For whatever reason, I am able to just listen without picking everything apart and wishing things were different. Rather than getting tense with listening time, I become more relaxed. I often check the thermostat to seek an explanation for my chills. For some reason, over decades of upgrading, I enjoyed fewer and fewer CDs. But with these components, I can enjoy my entire collection. I am so glad that I did not wait longer than I did. When the XA25 design became "known"; I knew I had to have one. I was correct.
What I can comment upon is my visceral response. For whatever reason, I am able to just listen without picking everything apart and wishing things were different. Rather than getting tense with listening time, I become more relaxed. I often check the thermostat to seek an explanation for my chills. For some reason, over decades of upgrading, I enjoyed fewer and fewer CDs. But with these components, I can enjoy my entire collection. I am so glad that I did not wait longer than I did. When the XA25 design became "known"; I knew I had to have one. I was correct.
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