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Single Ended Triodes (SETs), the ultimate tube lovers dream.

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RE: Dennis, thanks for the clarification.

Posted by tube wrangler on July 21, 2012 at 21:10:10:
You're on the right track, assuming you stay on it and spend the bucks necessary until you get it.
In the long run it's less costly because you'll not be needing something better later on.
The GPA 604-- even with their included passive crossover, is still the best thing out there if you really enjoy all kinds of music presented right. That crossover can be used-- and you can get good results-- if you'll unsolder the input and output wires and install something good like Siltech LS-38 or its modern equivalents.
Also, take a good look at the traces on any circuit board, and bypass them or short-cut them with better pieces of wire where runs get more than an inch or so away from a use-point. Make the whole thing more efficient.
The extra wires can be soldered directly onto the existing traces (parallelling them), and the original trace wiring can be left intact. Be sure to consider what you're doing-- for instance, a tweeter should "see" its capacitor first-- not find it further up the trace-line behind something else..... If this mistake is made on the board, bypass it with a wire, leaving the trace hooked up also-- use an equal-length high-quality, 12ga., multistrand audio-quality wire. Of course, Multistrand silver.
On a budget? Use Tinned Copper just like what came with it, but double-run each input and woofer wire with an equal length of the same-- simply ask GPA to send you some extra wire when you buy the drivers.. NOT untinned, and NOT solid strand-- use Multistrand of high quality.
For the tweeter? I'd splurge here even if broke and install single run of 12 ga. Siltech multistrand to the driver.. When you hear Cymbals, Triangles and Harpsichords, you'll thank Siltech.
Capacitors need not be replaced, just bypass then with small Dynamicaps. That bathtub resistor you're looking at isn't going to bite you-- you can keep it in, or you can slip-in a MILLS (12 watt sizes, please) to upgrade a bit. You can double the value and parallel two of them to get back to the original value, but match those to about 1/4% if you do that.
Why? Parallel resistors allow two paths for electrons to take-- so acceptance of a pulsed transient is faster, cleaner and is much more complete as the pulse passes thru the system.
Downside? Parallel resistors must have absolutely equal lead-lengths, and must measure within 1/4% of each other.
What about the stock inductors? Leave them alone!
---Dennis---