These actually sound very nice. The tone vontrol box was not tested though. I don't have the other plug needed for parallel power.
The amplifiers both work well. No overheating or funny noises. The amplifiers are slightly different in model, and cosmetically.
I believe one is an earlier model. The face panels are the same, the only difference I noticed on the front panel was the L. The rear panel also look very similar. The main cosmetic difference is the top/side cover.
The specs should be the same, but I'm 100% sure. I WILL SEPARATE THEM FOR THE RIGHT PRICE IF NO ONE TAKES IT AS A WHOLE.A only, and is high for all of it at once. The item "DB Systems DB-1 preamp, Tone Control, DB-2 Power Supply, and DB-6A and DB-6M amps" is in sale since Friday, December 17, 2021. This item is in the category "Consumer Electronics\TV, Video & Home Audio\Home Audio\Receivers & Amplifiers\Amplifiers & Preamps". The seller is "marjosadi" and is located in Chicago, Illinois.
This item can be shipped to United States, Canada, United Kingdom, Australia, Japan, South Korea, Indonesia, South africa, Bahamas, Israel, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Bahrain, Malaysia, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay.