- #102 [joly], 15-11-23 23:22
- #101 [drchan], 15-10-27 23:51Oldsam,
I have owned the Mei Xing and Audio Research using KT150
and found the Audio Research sound much better
major difference caused by transformer quality
My friend Terry making KT150 Single Ended amp,
but I have no chance to hear,
However I think the direct heated Triode single ended amp will sound better with lower efficiency, such as 101D, 2A3, 300B, 845, 833a & 212D
Dr Chan
最後修改時間: 2015-10-27 23:53:59 - #100 [oldsam], 15-10-27 12:24Dear Dr. Chan
Just for my curiosity, which KT150 amp sounds better, MingSing or Audio Research?
Do you also like SET with KT150 tubes too?
THanks
Sam -
- #97 [drchan], 15-10-15 12:01The circuit of Melody super 88 is very standard
and I do not see any reason that it cannot be replaced by KT150
subject to adjustment of bias
Dr. Chan - #96 [hk005], 15-10-15 11:06drchan,
i am using Melody Super 88 - Kt88 tubes . Can this tube amp change to KT150 ?
The Specification of the tube amp are as follows:
TECHNICAL:
Rated Output Power: 50W x 2 RMS
Frequency Response: 20Hz to 20Khz, +/-0.5db
Distortion THD: <1%
S/N Ratio: 85db
Input Impedance: 100Kohms
Input Sensitivity: 380mV
Output Load Impedance: 4 and 8 ohms
Power Consumption: 260W
Tube Complement: 4 x KT88
4 x 6SN7
2 x 12AX7
Thanks - #95 [schmike], 15-09-11 15:30XLO Ultra 6 喇叭線
我都好鐘意用
最後修改時間: 2015-09-11 15:38:50 - #94 [baker.steven], 15-09-11 10:4120W KT-120se Hashimoto 3.5K Output Transfomer, Po Shan power Transfomer
- #93 [CADiver], 15-09-11 09:43This will give you a standard MSRP$ idea of 6550 today
https://www.tubedepot.com/t/tubes/power-tubes/6550-kt88-kt90
More specific on GE6550, you can see here too. GE 6550 has already becoming rare. Many popular tube stores don't even have anymore.
http://tubeworldexpress.com/search?q=6550a+ge
最後修改時間: 2015-09-11 09:47:56 - #92 [伏喱哩], 15-09-11 09:31哇.太耐冇買膽.
一對KT150都要1K5.
咁4支咪3K.而家買GE6550A 4支幾銀? - #91 [tonytsui], 15-09-10 21:17Wrong post. Sorry
最後修改時間: 2015-09-10 21:19:31 - #90 [drchan], 15-09-10 19:55越來越多大廠推出KT150膽機
証明平靚正
大家無謂用天價再買名牌KT88 - #89 [old8210], 15-08-15 12:34
---- - #88 [drchan], 15-08-07 16:54Another schematic for KT150 single ended
- #87 [drchan], 15-08-07 16:38My friend started to DIY KT150 Single ended power amplifier
and the output is about 20W pure class A
and the tube cost $1500/pair
much cheaper than the 300B - #86 [drchan], 15-03-27 09:13As I stated before that all existing EL34/6550/KT88/KT90/KT120 tubes can be replaced and upgraded by Tung-Sol KT150, but subject to:
1. The distance between tubes, since KT150 is larger size;
2. The power output of transformer should be more than 500W, the static power after replacement by KT150 should be set at 300W;
3. The bias has to be adjust to control current and balance between tubes.
The main technic to control bias is two major types, the first type is supply positive or negative DCV to the grid, all EL34 family need negative DCV to the grid (-120V to -200V), the second type is to install a fix or variable resistor between the ground and the cathode of tubes, as a result, the voltage of Cathode is higher than the voltage at Grid.
I personally prefer to install a 1K 20W variable resistor for each power tube in series with a 200mA DC current meter, as a result, I can visualize the bias current and at the same time check the balance between positive and negative phase of tubes, furthermore since the Cathode is higher than the ground, the noise from heater filament can be reduced, one more advantage is to protect the tube for maximum startup current during switching on, the maximum current is equal to supply voltage divided by this resistor.
So far I have replaced 5 sets of Jadis (KT88 & KT90) and ARC power amp (KT120) to KT150, and found the improvement of sound quality is great changes.
Dr. Chan
最後修改時間: 2015-03-27 09:25:18 - #85 [LCKR], 15-03-26 22:45我用緊da8,唔知可唔可以換?
- #84 [drchan], 15-03-26 20:12One Ching ask about change of tubes for Jadis JA30 Power Amp
have the problem of adjusting bias,
I enclosed one sketch indicate that one 1k 20W variable resistor
should be installed between the cathode and earth/neutral
to replace the existing fixed resistors,
as a result, the EL34 can be changed to KT150,
the variable 1k 20W resistor can adjust the bias
and at the same time adjust the balance between the
positive cycle and negative cycle of the sound signal. - #83 [drchan], 15-03-19 23:47有幾位師問是否所有膽機都可以換上KT150
我的經驗是EL34 6550 KT88 KT90 和KT120
都可以換上KT150而且音色立即明顯升級
但是有幾個條件
第一是否放得落
第二電源牛是否有充足電力
第三必需重新調較偏流/偏壓 - #82 [drchan], 15-03-19 23:30雖然已經幫幾位師兄換膽
結果位位都非常滿意整體效果
並且開開心心離開
我見到都非常高興
現時還有幾位師兄想我幫忙換膽及調較部機
我是業餘抽空免費提供的
請各位先買到新膽後
與我約定時間並耐心等候
一切都是值得的
最後修改時間: 2015-03-19 23:33:07 - #81 [drchan], 15-03-17 14:01聽緊跟機KT90係大陸膽
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I am also interesting mei Xing KT150 integrated, but will use the power with external preamp, can u give a review for Mei Xing integrated, thanks