Elekit 8200 Tube rolling

[vkung]

This tube is good for TU-8500 not TU-8200

 

[sharpi31]

Oops, I thought this was a cap rolling thread for the TU-8500. Apologies. Mods please delete if my comments may cause confusion. Victor is 100% correct: E180CC is good to the TU-8500, not good for the TU-8200. Thanks Victor.

 

[vkung]

it is ok... good for TU-8500..
thanks
Victor

 

[nephilim]

I see that people are using 5814A instead of 12AU7 with success. Before doing the same I wanted to ask for confirmation: It seems that the maximum heater-to-cathode voltage is 200V for the 12AU7 but "just" 100V for the 5814A. Is that an issue with the 8200R?

 

[vkung]

TU-8200R is designed based on 6L6GC and 12AU7

 

[paczeltf]

It seems that the maximum heater-to-cathode voltage is 200V for the 12AU7 but "just" 100V for the 5814A. Is that an issue with the 8200R?

The heater-to-cathode voltage is about 3V in this amp.

 

[sunil]

6P3S anyone

Was wondering if its ok to try the 6P3S on the TU-8200 ?

Will the 6P3S-e work better ?

 

[paczeltf]

6P3S is not compatible with TU-8200 due to its lower max. plate dissipation.

 

[sunil]

Hi, my messing around with tubes has turned the mosfets noisy. I have to replace them.

These are available from a reputed source, would they work? Please help.

FQPF11N50CF or FDPF5N60NZ

 

[sunil]

Anybody, please help.

 

[SandorS]

Hi Sunil

Victor may be able to assist.
No worries.

Sandor

 

[vkung]

i already asked hi to order the original parts from ELEKIT.

 

[sunil]

Thanks Victor. Getting those parts in from Japan attracts customs and it becomes $$

That's why I was wondering if those other mosfets would be a replacement.

 

[sunil]

Guys, please be careful with 6P3S. I tried them before Ferenc's advise and it messed up the amp.

While they worked for about 4 hours, it sounded great though. The amp got really noisy after that.

 

[paczeltf]

It is likely that the 6P3S got damaged first.

 

[SandorS]

Yep. Here's info I had received from Tamura-san as for 6p3s and 6p3s-e.

Dear Mr.Somogyi,

Thank you for your e-mail.

Yes, it is about the anode dissipation.
Actually it has to be 25 watts.
KT66 is OK because it is 25 watts, that is the least line,
20 watts is a bit too small.
It might be OK to use it for a while, but the tube life will be shortened for sure,
and some other trouble could occur, so we cannot recommend it.

Best regards,

Emi Tamura
EK JAPAN CO.,LTD


2020年9月24日(木) 0:44
Dear Tamura-san,

Thank you very much.

I was wondering if anode dissipation is any issue? 20 watts for 6P3S as far as I recall (may be design center value). I think KT-66 has 25 watts value.

 

[Beacon70]

Does anyone has experience with Mullard KT88, or other KT88, being driven by the 8200? Likes/ dislikes? Considering everything that is going on, wondering if it would be worthwhile to stock up on a few?

 

[Mikerodrig27]

I ran a KT88 for a short period. It was nice. I was borrowing them so I had to give them back. I only had a day with them. I have a pair of RCA (made by tung-sol) 6550's that are sublime. The KT88 that I tried was a bit more aggressive. The 6550 was more pretty sounding but still had grunt.

 

[Beacon70]

I ran a KT88 for a short period. It was nice. I was borrowing them so I had to give them back. I only had a day with them. I have a pair of RCA (made by tung-sol) 6550's that are sublime. The KT88 that I tried was a bit more aggressive. The 6550 was more pretty sounding but still had grunt.i

 

[Beacon70]

Do your remember the brand of the KT88? I will look into the 6550 also. Thx.