PA-10 Tube Headphone/Pre amplifier

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FAQ

1. Can Trends PA-10 Tube Headphone/Pre amplifier be the Phono Amplifier ?

No. Trends PA-10 Tube Headphone/Pre amplifier does not support RIAA.

2. What are the difference between CD Input and PC/iPod

The CD is normal input. The PC/iPod input with higher gain is provided for small output Phono amplifier or PC/Mac/iPod.

For example:
CD Input: Standard gain = 3 x
Phone Input: Hi gain = 6 x

3. It is very loud, boom with flabby bass when I turn on Trends PA-10. Why ?

It is normal that the vacuum tube have to warm up for several minutes to the stable condition. The temperature is also a factor for the bias voltage.

4. I once accidentally turned on the Trends TA-10 T-amp before I turned on the Trends PA-10 Pre-amp and the tube kept blinking with an intermittent popping sound. Any explanation for that?

We suggest that you turn on the Trends PA-10 Pre-amp firstly. For example:

.	Trends PA-10 Pre-amp	TA-10 amp./other Power amp.
Switch On:	First	Second
Switch Off:	Second	First

5. How can I change another vacuum tube for Trends PA-10 Tube Headphone/Pre amplifier?

Trends PA-10 Tube Headphone/Pre Amplifier supports two major tube series: (1) 6DJ8, 6922, 6N11, 6H23n, ECC88, E88CC, etc…, and (2) 12AU7, 5963, 5814, ECC82, etc… If you change the tube within the same series, it needs to re-tune the DC bias voltages ONLY. If you change the tube from another series, it needs both to re-tune the DC bias voltages and re-set the jumpers. Otherwise, the tube may be burnt out.
For more details, please read Bias Setup

6. How do we set the best sound performance from the Trends TA-10 Amp and Trends PA-10 Tube preamp bundle?

Trends PA-10 Tube preamp support CD input with 3X high gain. Please refer to the following setting for the best performance from Trends TA-10 Amp and Trends PA-10 Tube Preamp

- Trends TA-10 Amp as an Integrated Amp

.	Trends TA-10 Amp.	Trends PA-10 Tube Preamp
Volume Control(Maximum)	12 o'clock	Any level

- Trends TA-10 Amp as a Power Amp

.	Trends TA-10 Amp.	Trends PA-10 Tube Preamp
Volume Control(Maximum)	Fix	9 o'clock

For more details, please read our Technical Note

7. Using the headphone, I only get sound in one right ear. There is a very slight sound in the other left ear.

The DC bias for the left ear channel may be incorrectly (as close as to +16.5V). Kindly refer to Bias Setup for making the balanced both ears.

8. Why Trends PA-10 tube headphone amp. provide better performance for high-impedance headphones?

High impedance phones work better with amps that can do strong voltage swings, usually tube-based for best results. Low impedance phones correspondingly are supposed to work best with amps that deliver high current, such as solid-state designs.

9. Are RCA outputs muted or not when the headphones are connected to the preamp?

Not muted and the outputs are simultaneous.