My friend's mom had this massive Motorola portable record player that had a single-ended 6BQ5 amplifier. She didn't want it, so I made it into a plug and play tube amp for my friend. He listened to it and likes it.

I liked the amp with a Telefunken 12AX7 and Mullard El-84's, which happen to be rather spendy tubes to find......the bass is rather strong for a little 5, 8 watt amp.

The record player with amp had a volume control, treble,bass, and balance control. Input went into the volume control through one section of 12AX7, through the tone/balance controls, and then to the second half of 12AX7. RC coupled to the EL-84/6BQ5 output tubes.

Each output tube used both sides of a 12AX7 with a AF and tone amp section.
I ditched the little tone amp section, and went with two halfs of one 12AX7 to drive both output tubes.
Pretty much the stock Motorola PS, CRCRC with a 5Y3 rectifier.
The 12AX7 still uses the original 1.8K cathode resistors, with 100K on the plates. Straight in through a 3 dollar radio shack 100K volume control, to the grids of 12AX7.
No suppessor or grid to ground at 12AX7 input. Old pryamid .082 uF 600 volt oil caps are used for coupling to EL-84, with 470K to ground at the grid of the EL-84. Output tubes are self biased with a 150 ohm 10 watt resistor with a nichicon 100 uF 35 volt for cathode bypass.

It has plate to plate feedback from the output tubes to the 12AX7's with a 2.2 meg resistor and 2000 picofarad cap in series.
I swapped to a 1500 picofarad silver micas I ripped off out of a TV. The originals were ceramics, I think it might have helped.....

AC heated to indirected heated tubes, with a 100 or 300 ohm resistor to ground off one leg of the 6.3 volt AC heater winding.

I need to get some more decent binding posts, and some cosmetic work.