I am reducing my collection of amps and I am selling 2 of my 3 Eicos HF-81 (one is already sold to Eddie). This is the second one. Arguably one of the best EL 84 based tube amp ever made, this one has been upgraded for reliability and the possibility to accommodate modern ICs and speaker cables. Otherwise it is in vintage shape. Modifications done to this unit: All new power supply capacitors, which includes 2 40uf/450v , the can cap which was replaced with a JJ 100uf dual at 500v, plus an additional 220uf under the chassis. The speaker terminals have the 4 ohm and 8 ohm taps connected to the binding posts. The original rca jacks were terrible in these amps, making bad contacts and having intermittent grounds. The new rca jacks are tight and have a solid ground. All the jacks were replaced on this one!! This comes with a new Heyboer extra heavy duty power transformer, which has more metal core and the heaters can handle a few extra amps than their regular replacement version. It comes with a new power cord. Volume pot has been replaced with an ALPS 250 k and a shaft extender to keep the original knob. The input selector control was another bad flaw on these Eico’s, after time the contacts would get loose and dirty and cause static, hum and intermittent operation. The mono/stereo blend switch has been bypassed, and the on/off control on the treble shaft has been moved to the old tape switch on the front. The tubes in this one are mostly JJs. and going strong.
Re: Eico HF-81 #1 Highly Modified
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