Phono amp Raytheon 6418 tubes

[Zero One]

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.

 

[kevinkr]

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

 

[studeb]

oatley has a new kit out with the phono. K282

 

[rparsh]

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.

 

[Zero One]

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.

 

[Cale06]

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.

 

[audi0]

Progress

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!