Cheap DAC w/ volume control for direct amp input?

Would like to feed an amp directly to not need an integrated amp. Thanks for any info.
Easy. Grant Fidelity Tube DAC09. $300 new. Show up here used at times. A bargain. I use mine with a Dynaco ST70 with great results.
Another option is one of the variations of the Beresford 7520. The latest version has a number of upgrades from the original and has gone up in price a bit. I have the original but with upgraded opamps and it's a very good DAC for the money, with a good headphone amp and preamp as a bonus.