Hum control works and I was able to remove the hum. All tubes light up after turning on and they are fitted with the following.
SOVTEK 300B Made in Russia. SOVTEK 6SL7GT Made in Russia.The internals are point to point wired. Bottom cover is missing screws and rubber feet. The transformer screws does not have some of the black caps on it. Three knobs for the adjustments are missing. The chrome surface finish needs some cleaning and have a spec imperfection 1 inch away from the 300B socket at the 10 o'clock position. Size is about half a grain of rice. The item "Golden Tube Audio SE 300B Single-Ended Triode MonoBlock Power Amplifier" is in sale since Sunday, June 13, 2021. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps". The seller is "franciscracken" and is located in Fremont, California. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Taiwan, South africa, Belgium, France, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay.