Preamp Tubes for KR AUDIO 18 BSI

The owner's manual should be able to tell you the type of tubes used. The tubes themselves are also probably labeled as well. Once the stock configuration is known, just let us at least know the type of tubes you already have, what type of music you play, and perhaps what you perceive is lacking in the sound that you are getting. Suggestions can then be made based on cost, and sound characteristics of variously branded NOS as well as currently (and plentiful) available types.

Mr Mcfarland, thanks for your reply =)

I never knew it has that much to know, i thoght it is just a tube.

The tubes are Ei- Yugoslavia ECC-82 an the other set are 5687WB.

The treble gone abit, never happen before, so i guess it is time to be replace them? They were long here...

So type of tubes should i be looking into replace them?

currently, it have all the juice from treble to bass, but the soundstage is not as clear and 3D as solid states amps, thats the field i want to improve on...

or that part is not done by tubes?

Please teach the silly me hehe, thanks =)

Hello Deramg. The two outside tubes are the 5687's. The 5687 is a dual triode developed for use in computers. The original nos tung-sol black plate 5687 is "far and away" the best sounding tube of that type. You may also substitute the 5687 with a 6900 or 7044 [ direct plug in replacements]The two inside tubes are 12au7/ecc82 dual triodes.The Ei ecc82 isn't a bad sounding tube but can be vastly improved upon with many brands of nos 12au7/ecc82 types but it is imperative that they are quiet and non microphonic. The early 60's vintage amperex bugle boys are terrific in that spot.