yold You are strapped for cash, but want an HF amplifier. Even the priced of a used Ameritron AL-811H is prohibitive. Some inexpensive 811A amplifiers are available, but the Chinese 811A tubes fail early. And, the 400 watt output sweep tube amps may not produce enough power plus the tubes are very expensive. Even worst budget wise may be on a fixed income such as SS and future tube costs are an issue too. Chinese 811A tubes may not last 2 years. Not well known are the Russian built G-811 tube. Starting with the letter 'G' throws off most looking for cheap 811A tubes on eBay. The G-811 is a very well built tube like 1940s thru 1960s 811A tubes and last a very long time. The good news is the G-811 is available new from the Ukraine for $13 each including shipping. The plate is not the same as older RCA 811A with the horizontal plates. But the tubes hold up well at 600 watts PEP output. Just do not take more than 5 seconds tuning the amplifier or risk burning holes in the plates. Keep a record for tune and load settings for each band and this issue goes away. I seen vintage 811A amplifiers for $300 on the Ham Radio sites & ebay plus under $300 at Ham swaps. These $200-$300 HF amplifiers includes the Heathkit Warrier HA-10 and the Gonset GSB-201. The amplifiers do not have a tuned input but four 811A tubes have about a 2 to 1 SWR. And no tuned input is great for the WARC bands. Plus, your SS HF transceiver may have a built-in antenna tuner. You will also need a keying interface to reduce the amplifier high voltage keying in the HA-10 or GSB-201 to low voltage as to not damage your transceiver. The keying interface is around $30. If you have some skills or should develop skills to replace the old HV electrolytic capacitors in the HA-10 or GSB-201. The capacitors are available for about $5 each in the 'snap-in' design and even less at surplus stores. Careful with the high voltage, unplug the amplifier and use a screwdriver with an insulated handle to short the HV to ground before working on any tube amplifier. If you get lucky and find an Ameritron AL-811H for under $400, buy that amp. It does not need a keying interface or new HV capacitors. And, remember the Russian G-811 tubes as it is the best deal on the planet! Good luck on your search.