![]() I have a couple of multimeters, an old Tektronix 300MHz analog oscilloscope, and a frequency generator. I'm going for hi-fi and wondering where to go next with the limited equipment I have. I didn't put a tapered pot on the input, nor measure the voltage output of the iPhone, and actually assumed I'd need to put another stage in. I guess I was just surprised it worked the first time and didn't catch on fire! I was able to read about 100dB out of the speaker when I turned the iPhone up to max. Honestly like the first time I heard my son cry when he was born. I have to say I did well up a bit when I first heard it make a sound. No discernable distortion, very fair frequency response, decent volume - all of this subjective. I powered it up and used an old iPhone(burner phone, just in case) to give a signal, using a crappy Best Buy brand speaker(it's all I have right now and honestly wouldn't mind blowing if something went wrong). ![]() The full design so far is using an 12AX7 and two KT88s, with an unloaded B+ of 530V. I only did a one-channel prototype, as I built it on an acrylic sheet with standoffs and only had so much space. I decided that I can only model so much and just have to breadboard the damn thing. Thanks to everyone who helped me with design and unfounded fears around certain details. I'm writing this out in notepad before trying to post again.įirst. ![]() The site made me log in again and discarded what I wrote, maybe it was for the better, but sorry if this one sounds a little more sterile and I am no longer describing possibly important details. I'll start off by saying I wrote a long post, and unfortunately took too much time.
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