Eico Restoration

We offer complete cosmetic & electronic restoration for the following models of EICO HF-series amplifiers/preampifiers: HF-12, HF-81 and HF-85.

We offer electronic restoration only for the entire line of Eico "HF" series power amplifiers: HF-14HF-20, HF-22, HF-35, HF-87, HF-50, HF-52 and HF-60

Cosmetic restoration:

Chassis is taken apart and powder coated satin black.  Top grille is power coated gold brass controls plate is polished to mirror shine.  All knobs are painted glossy black. If desired transformer bells are also powder coated black.

Electronic restoration:

Power supply rebuilt, using a new, multi-section twist-lock capacitor (the metal tube that sticks out middle of chassis), as opposed to gluing radial caps on bottom of amps as I often see. The latter is just as sound electronically and a lot cheaper of course ($4-$8 vs $40/$80 in parts alone) but your gear and you deserve better.

All electrolytic, coupling, bypass, bias voltage, and negative feedback circuit capacitors are replaced with brand new audiophile grade caps.

We do not use “NOS” (new old stock) caps — The equivalent of asking the hardware store for some “vintage” AA batteries. You know, the kind that have sat in a drawer for a decade….My father tells me beef tasted so much better pre-1950. I believe him. But do I buy New Old Stock hamburger meat? I think not. “NOS caps” have sat unused for 50 years or more…. And using them now is just one bad idea. I recently acquired an unbuilt Eico HF87 kit. Tested all the enclosed NOS Goodall, Black Cat, and ‘lytic caps — ALL were bad.

We have done and continue to do thorough side-by-side comparison of numerous brands of caps in order to stay faithful to the beloved vintage tone. We use only recently manufactured parts of the highest quality available, handpicked for their sonic performance. If you believe you have a brand of cap you would like to use, by all means speak up. But we will not install NOS caps. They are just as old, dead, or dying as what is in your amp right now. And will underperform just the same.

All resistors are replaced with a combination of wire wound, carbon comps, and metal film depending on circuit location, in order to maintain tone (carbon) and reduce noise and distortion (metal film).

All contacts, pots, tube sockets are cleaned and deox’d, and if beyond cleaning/deoxing, are replaced for a noise-free operation. Note that in the case of some models (HF85 volume control, HF85 and HF81 tone controls) this may mean losing the dual/concentric control as no new pot that offers that feature fits either models.

New power cords are affixed.

Finally, once work is completed, amps are thoroughly bench-tested to make sure they are back on spec. They are then for several days to make sure no kinks arise and to begin the breaking-in process of the new parts, and shipped back to you in some very serious, damage-proof packaging.

I will check your tubes with my three tube testers (including a digital “MaxiMatcher” for current draw matching and will tell you which are good and which are not. But I am not a tube reseller, hence you will need to find yourself a reliable source for tubes.

An important note about the HF-81’s power transformer and on/off switch:
Eico’s HF 81 is a true sonic marvel. With a few issues: 1. The power switch which had been (not very smartly) coupled with the treble pot, causing unnecessary wear on that part. I move it to the back of amp and put a slide switch at rear in place of AC outlet or if you prefer I put the same slide switch in place of the now obsolete tape switch. Or kill it altogether and you turn your amp on and off with power strip. 2. The power transformer of every single HF-81 I have encountered eventually develops a mechanical buzz, which is annoying at best. Heyboer, that transformer’s original supplier makes an exact clone ($120 or so) and highly recommended. In no way does it change your amp’s sonics (it’s the output transformers that have impact on sound, not the PT as  no audio signal goes through it. Just line voltage.)

All our electronic restoration work comes with a 6-month parts & labor warranty. Shipping costs to and from us are your responsibility.

Contact us for pricing, current turn-around time or any other further info you may need.