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Old 9th June 2019, 09:43 PM   #21
paczeltf is offline paczeltf  Hungary
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I saw that. It starts really good, but after a few pages the whole thread should have been renamed to "How to bastardize your TU-8200DX".

That thread also has a very bad message, at least for me. It is fine if you do some experiments but at the end, you should settle, stop tweaking your amp and just listen to music.

There are much better things in life than rolling tubes constantly.
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Old 10th June 2019, 12:42 AM   #22
oface1 is offline oface1
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Oh, I agree with your assessment. it is a tough read, especially if you're like me. I haven't done any "mods" besides what came with the "DX" kit. I have kept the rolling of tubes to a minimum. Mainly am wanting to mod mine to where I can use a less microphonic tube besides the 12au7.....

Was trying to find more info in the thread on the mod to upgrade the driver current so I could use 12by7, since I have a HK Citation II as well. But I can't find it in that thread, since it goes everywhere.....
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Old 10th June 2019, 06:44 PM   #23
paczeltf is offline paczeltf  Hungary
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Quote:
Originally Posted by oface1 View Post
...Mainly am wanting to mod mine to where I can use a less microphonic tube besides the 12au7.....
The 12AU7 should not be microphonic. Power tubes tend to be more microphonic than driver tubes in a power amp anyway.

Quote:
Was trying to find more info in the thread on the mod to upgrade the driver current so I could use 12by7, since I have a HK Citation II as well. But I can't find it in that thread, since it goes everywhere.....
If you apply all the modifications that I recommended in this thread then you will be able to use 12BH7, which is what you presumably meant. 12BY7 is a pentode (beam tetrode actually). On the other hand, 12BH7(A) does not really fit the TU-8200.
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Old 10th June 2019, 06:50 PM   #24
paczeltf is offline paczeltf  Hungary
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Quote:
Originally Posted by Sandy82579 View Post
Two things. On your spreadsheet updates C34-C35 have the same “original value” and “new value”. Should the “new value be the same as C33? 330-470uf/16v

Also you say about the E80CC “the rectifier upgrade is not enough to support these great tubes correctly”. What would need to be done to correct this.
You also sent these questions in PM, which is what I replied to.

Conclusion is that the spreadsheet is correct, the new C34 and C35 are OS-CONs with the same value like the cathode bypass capacitors in the DX upgrade kit.

Driver tubes with 600mA heater current can be used after these mods as long as you use them with a 6L6GC variant.
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Old 16th June 2019, 03:23 AM   #25
Sandy82579 is offline Sandy82579
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Default Modifications to Driver Section

You mentioned in one of your posts that you were satisfied now that you had completed you updates to the Driver Section. I assume that those changes were above and beyond the changes in the spreadsheet you posted. Could you tell us what mods you made to the Driver Section.

Thanks,
Sandy
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