Beef Up that Pwr Supp. Cap Bank

Posted by Interstage Tranny (A) on November 22, 2007 at 18:29:43

In Reply to: Thanks for the suggestions, I am ... posted by PeterI on November 22, 2007 at 09:34:09:

After the input filter cap, not to mention the high DCR B+ winding, the rectifier tube can tolerate lots of capacitance. I definitely suggest beefing up the cap values. Instead of 20-40-40, you might like 20-100-100 uf, which will definitely increase bass impact and speed, without sacrificing sweetness.

I have long recommended this preamp as the ultimate sleeper. But, with the HF-81 getting hot-rodded and reviewed in Stereophile, the prices have shot up. By the way, do you remember the terrible looking waveforms in the Stereophile review ? Still, a month or two after, the price tripled ! The preamp stages of the HF-81 integrated are VERY close to the HF-85. It seems that the HF-85 has almost tripled in value, as well, so it no longer qualifies as the sleeper it was. I guess the sleeper term is now reserved for the Arkay SP-6 preamp, another obscure kit. ENJOY !!!

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Follow Ups Full Thread

Topic - Eico HF-85 pre, How does this thing sound so good? (restoration) - PeterI 21:02:56 11/21/07 (16)

I first heard the HF-85 - kstagger 16:03:58 11/22/07 (2)

I belive I was one of those people - anumber1 17:05:25 11/22/07 (1)

two preamps - PeterI 21:35:42 11/22/07 (0)

I do believe that people from that era...... - Tromatic 15:00:59 11/22/07 (1)

RE: I do believe that people from that era...... - George Mann 18:08:29 11/22/07 (0)

RE: Eico HF-85 pre, How does this thing sound so good? (restoration) - Rust 09:59:14 11/22/07 (0)

Change the GoodAll caps! Change All The Capacitors! - anumber1 06:09:01 11/22/07 (8)

Thanks for the suggestions, I am ... - PeterI 09:34:09 11/22/07 (5)

Beef Up that Pwr Supp. Cap Bank - Interstage Tranny 11/22/0718:29:43 11/22/07 (0)

have you tired .. - Oface 10:46:41 11/22/07 (3)

RE: have you tired .. - PeterI 11:10:40 11/22/07 (1)

you're welcome , ;))!! - Oface 12:48:04 11/22/07 (0)

meant *tried* - Oface 10:57:15 11/22/07 (0)

thanks for the reminder :-) - mhardy6647 08:59:06 11/22/07 (0)

I like the General Instrument/Pyramid Imp caps, but - Interstage Tranny 06:18:31 11/22/07 (0)

RE: Eico HF-85 pre, How does this thing sound so good? (restoration) - Michael Samra 04:41:05 11/22/07 (0)

Follow Ups

Beef Up that Pwr Supp. Cap Bank - Interstage Tranny 11/22/0718:29:43 11/22/07 (0)

Beef Up that Pwr Supp. Cap Bank

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