Hallicrafters Model A84 Super-Fidelity Amplifier

Chicago-made 10w Williamson push-pull amp. Somewhat rare (Hallicrafters was better known for ham radios).
According to an ebay seller:
"This was designed by the same engineer who later designed amps for Radio Craftsmen, including the model 500 and 500A... Stated frequency responce is +,- 1db 9 to 100,000 cps at 10 watt output and THD is less than 0.14% at 10 watt output. Measured output is 14 Watts into 8 ohms."

Here is one for sale in June 2025: A84 2025-06

Here was one being offered in 2004: old sale

Components:

• pair of 12au7a / ecc82
• 5V4G / 5AR4 / GZ34 rectifier tube
• a pair of KT66 / 6L6GC / 7581A / EL37 output tubes
• large heavy potted output transformer marked Hallicrafters 55D203B, looks like an Arco

In the two columns below are pictures of my two A84s.
Both worked & sounded great for a few years, until 2013, when one started squealing,
and the other developed a huge "leaky" capacitor, I mean literally leaking and dripping oil.
For a long time I've been planning to restore these. When I do, I'll post more pictures.
Serial no. 533. Inherited from my father.	Serial no. 217. Bought for $204 in Mar 2003