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Request for 3Q5GT Single Headphone amp schematic
Request for 3Q5GT Single Headphone amp schematic
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Old 10th November 2017, 07:35 AM   #1
supernut is offline supernut  Thailand
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Default Request for 3Q5GT Single Headphone amp schematic

Can anyone suggest link of 3Q5GT Single Headphone amp schematic?

I got 2 tubes from friend and want to do headphone amp instead of buying Chinese E200 Headphone amp which cost me RMB 1100.

Thank you.
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Old 10th November 2017, 09:02 AM   #2
jazbo8 is offline jazbo8
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Request for 3Q5GT Single Headphone amp schematic
Which headphone?
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Old 10th November 2017, 03:25 PM   #3
supernut is offline supernut  Thailand
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Beyerdynamic DTX 350M
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Old 10th November 2017, 03:25 PM   #4
supernut is offline supernut  Thailand
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Any schematic of "Quickies" preamp add choke and OPTS?

I think it seem ok
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Old 10th November 2017, 04:00 PM   #5
audiowize is offline audiowize  United States
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Quote:
Originally Posted by supernut View Post
Any schematic of "Quickies" preamp add choke and OPTS?

I think it seem ok
No. Your headphones are low impedance and won't do well with such an arrangement unless you want to use 4 tubes.
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Old 10th November 2017, 07:08 PM   #6
Dragon Lord is offline Dragon Lord  China
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3Q5GT的负载阻抗非常高,做耳放的话肯定要用输出变压器的,标准运用的数据是屏极负载阻抗Ra=8K, 屏压Ua=90伏,帘栅极电压G2=90伏,栅压G1=负4.5伏,输出功率Po=230毫瓦

灯丝最好用电池供电,否则会引入讨厌的交流噪声

IMG_2105.JPG

IMG_2106.JPG
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Old 10th November 2017, 07:16 PM   #7
Mooly is offline Mooly  United Kingdom
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Request for 3Q5GT Single Headphone amp schematic


English only please

Quote:
The load impedance is very high, do the ear put words must use the output transformer, the standard use of data is the screen load impedance ra=8k, screen pressure ua=90 Volt, the curtain grid voltage g2=90 volt, grid pressure g1= minus 4.5 volts, output power po=230 MW filament best battery power, Otherwise, it introduces annoying ac noise.
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Old 10th November 2017, 09:10 PM   #8
supernut is offline supernut  Thailand
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Thank you very much Mr. Dragon Lord.

3Q5GT the load impedance is very high, then do use the output transformer, the standard use of data is the screen load impedance Ra = 8K, screen voltage Ua = 90 V, the grid voltage gate voltage G2 = 90 V, gate voltage G1 = Negative 4.5 volts, output power Po = 230 milliwatts

The filament is best battery-powered, otherwise it will introduce annoying AC noise


Translated of Mr. Dragon lord
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Old 10th November 2017, 09:20 PM   #9
supernut is offline supernut  Thailand
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1. How much the Capacitor value?

2. How much the OPTs value ?

Thank you very much.
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File Type: jpg 3Q5GT battery1.jpg (177.5 KB, 109 views)
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Old 10th November 2017, 09:52 PM   #10
Dragon Lord is offline Dragon Lord  China
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那是一个耦合电容,一般取值0.01-0.47微法拉
That's a coupling capacitor, typically taking 0.01-0.47 micro Faraday.
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