Re: new speaker, or new tubes, come tell me what to do
The first thing I would do with the Hot Rod (I owned one) is to replace the pre-amp tubes. Probably some JJ's to smooth out the sound. Talk to bob at eurotubes. He will suggest some JJ power tubes as well, and they might be ok. IMO, Svetlana is making the best production power tubes right now, followed by EH. Check out the Svet 6L6's.
Next I'd change the speaker.....yup, you need to change all 3 items to really get the most out of that amp. Lots of people like Weber speakers in the HRDlx's, either the Silver Bell or the Blue Dog if memory serves. Send an e-mail to Ted Webber with what type of sounds you are looking for, and he'll make a no nosesense recomendation. I personally like the Eminence speaker line.....you can get a bunch of good ones for around $50.
With all the above changes, you will get some great clean tones, decent low to medium grit blues and possibly classic rock tones....but that is about it. Anything else from that amp in the overdrive department will require a nice pedal run thru the clean channel. That 's one thing the HRDlx's are good for....a platform for pedals and effects.
The reason I ultimately sold mine was the overdrive. I wanted an amp that could do blues and classic rock up to 80's rock with just a turn of the gain knob....for that you need something like a Marshall. How much is all of this going to cost me you ask?:
Pre-amp tubes (4 I believe) $45 shipped approx.
Power Tubes - Around $40-50 shipped
Speaker - $50 min to around $100 (depending if you go eminence, weber or celestion)
$200 would do it right....you might be able to get away for $150 if you shop hard and go eminence on the speaker.