Being biased hot, I guess the use of an attenuator would eat tubes really faster than "regular", because you (he) will crank the amp and all of the tubes will wear faster. I did not try my DC30 with any attenuator, but I installed the Variable Voltage Regulator and it's been a winner since.  I posted about on this same forum. Maybe it is a good (and not expensive) way to try for you guys.

It basically reduces the voltage on the whole amp, allowing you to get crunch tones at lower levels (it reduces at 10% the amp full power). To me, it opened a whole new unexplored stage of this amp....

Regards

There isn't one.  Plus, for the price of a decent attenuator you can buy a small SE amp. Valve Jr., Champ/Vibro Champ, etc.  IME attenuators are much better suited for taming stage volume on 20-100 watt amps.
Good Luck

+1 may I correct!

I have VVR on my DZ30, and don't like it much. The master vol sounds better to me. Perhaps it depends how much you overdrive it, I like it to just break up a little.
However, the DZ30 is way too loud for a bedroom in a house where stage levels are not welcome (even 15w mode): best to get a 5w amp for that sort of domestic situation
1w to 5w amps sound better in a quiet house than a 30w amp that's quietened down.
My THD hotplate loses tone, and sounds poor below -4dB, which is not low enough for your needs (it's good for for tweaking loud levels, or giving a DI load, but -12dB or lower sounds poor). AFAIK all power soaks lose tone

Try an AC4 maybe? they are very cheap. I dislike the fact that most of the lower power amps have cheap tonestacks, but there are some with more, like the BH5.
A guy in the UK here takes the cheap Chinese amps (Epi VJ, BH5, etc), and does all the good mods around, fixes the buzzes and tweaks PSU, adds tube recitifier, etc.
His amps sounds really good at house-friendly levels for £250-£400, none of my 30w-100w ones can run that quiet and sound good, I've had an isolation box built for when I need to keep the loud amps quieter. Even my Vox AC15H1TV is too loud when it's late. The Marshall Class 5 sounds ok, but rattles like hell, it has a cheap chassis.

If he has a recording setup, an ISO box is another solution, Randall do one that sounds good, but does let some noise out. Then the DZ30 could run into that and use the monitors at whatever preferred level. This is the best solution I believe

sounds like I'll have to give that a try....where did you get it for such a good price?

Has anyone made and posted sound clips or videos??