That's pretty cool to see the two amps side by side (well almost). I can see subtle differences on the input board and the power supply boards are bigger. Those white ceramic things are resistors and I have no idea why there are so many. These amps are more similar than they are different, that's for sure.
Those white ceramic things are resistors and I have no idea why there are so many.
They are the emitter resistors for the output transistors.Each output transistor will have one.
Not exactly. The emitter resistors are located on each output board. They are grey striped resistors, not the big white ceramics. The emitters can be seen in my closeup of the transformer. On my 2200ii, the big white ceramics are all attached to the power supply boards. I haven't taken the time to look at the schemetic and figure out their purpose yet.
Here's the insides of my Parasound HCA-2200.
Notice the massive stacked torodial trannies and dual sets of caps.
Everything else seems pretty bread & butter, just on a bigger scale.
Anyone know where I can get some nice metal binding post nuts to replace the crappy plastic ones that are breaking? I'm gonna post this question in another thread since this one is way looooong.
ETA: Seems like the MkII has almost double the little white, ceramic looking things that are part of the output sections. That and the switches for un/balanced seem to be the only non-cosmetic differences that my untrained eye can see. ***BTW, my 2200 is SDA-safe.***
Man, this is one fascinating thread..........:cool:
I-SIG wrote: »
Parasound HCA-1000 pics coming tonight!
I-SIG wrote: »
Here's the happy snaps of the interior and **** of the Parasound HCA-1000A. It's like a mini-single transformer 2200, kinda.
billbillw wrote: »
Actually looks just like the inside of an HCA-1500a, but smaller everything. The layout is almost exactly the same.
See Gator's post here:http://www.polkaudio.com/forums/showpost.php?p=532815&postcount=257
louthewiz wrote: »
Here is my little amp that has 150 wpc driving a pair of rt400 vintage polks!!:D
Early B. wrote: »
Here's a few pics of my Marsh A400. It's got the biggest transformer I've seen -- about 6 in. in diameter and about 4 in high. The blue caps are 15,000 uF capacitance each.
GV#27 wrote: »
Just dug this out of storage today.It as Nelson Pass diy Mosfet design that I built several years ago and no longer use.It is a good sounding unit with the mosfets imparting a tube like quality.I put the transformer in a separate case to avoid induce any AC hum. I guess I better find it a new home instead of letting it collect dust.
hearingimpared wrote: »
Nice looking piece, good work.
Got my Emotiva UL combo about 2 weeks ago, but the processor was DOA