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Old 9th March 2010, 11:22 AM   #1
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Default Phono amp Raytheon 6418 tubes

This is my first post on the tube forum, quite possibly there is no answer for this.

I was wondering if any body knows if there are any schematics for phono pre amps built around the Raytheon 6418 sub miniature pentodes.

There is a mic amp, and headphone/pre amp available from Oatley electronics in OZ.

The above ones work on battery power and by all accounts actually sound rather good.

I suspect they may also work well for phono use, probably with boosting via and IC.
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Old 9th March 2010, 04:33 PM   #2
kevinkr is offline kevinkr  United States
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Take a look at the mirror of Steve Bench's site, he designed a submini pre around 6088 and 6418 which might be of interest. (He used the 6418 as anode followers to drive a tape out.)

6088 Based Battery Powered Full Feature Preamp
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Old 3rd May 2010, 11:07 PM   #3
studeb is offline studeb  United States
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oatley has a new kit out with the phono. K282
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Old 4th May 2010, 12:46 AM   #4
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Default Oatley phono preamp

I just bet everybody who buys one will gripe about its microphonic tubes and its lack of center of balance between channels.
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Old 4th May 2010, 07:59 AM   #5
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Thanks for the tip Studeb, that is a recent addition I knew nothing about and I suspect it might work quite well, plenty of scope for modding and the price is sweet too.

I will order one and build it up.

I think I can keep the microphonics under control and balancing channels will be easy enough.
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Old 4th May 2010, 03:06 PM   #6
Cale06 is offline Cale06  United States
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Anyone have an extra ideas for controlling microphonics beyond the grommet on a tube method? I've been playing around with some 6418s and occasionally they just like to start singing even if you don't hit them.
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Old 7th July 2010, 10:39 AM   #7
audi0 is offline audi0  Australia
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Default Progress

Quote:
Originally Posted by Zero One View Post
Thanks for the tip Studeb, that is a recent addition I knew nothing about and I suspect it might work quite well, plenty of scope for modding and the price is sweet too.

I will order one and build it up.

I think I can keep the microphonics under control and balancing channels will be easy enough.
Hi Zero One,

any progress with this? I did see that the guys at the Melbourne Audio Club built one with upgraded components and an improved power supply and noted:
I would say whichever way you go on to build the kit, you will not be disappointed. In a blind listening test the basic kit outperformed two Cambridge phono preamps and a Hafler phono preamp in front of six very critical listeners of the Melbourne Audio Club, across three different turntables and cartridges. Impressive!
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