• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Which chinese amp should I go for ?

Which amp should I go for?

  • Amplifier #1 Himing Rival Fu-50

    Votes: 2 40.0%

  • Amplifier #2 Nobsound 2017 Handmade 6P1

    Votes: 3 60.0%
  • Total voters
    5
  • Poll closed .
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6

6A3sUMMER

Member
Joined 2016
The 5Z4P is an Indirect Heated Rectifier. It has Cathode(s), and it warms up Slowly, so the other tubes do not get B+ until they are also fairly warm. (A good thing). 5Z4P has a 2 Amp filament.

The 5U4G is a Direct Heated Rectifier. It does Not have Cathode(s), and it warms up Quickly, so the other tubes get B+ before they have warmed up. (not as good) 5U4G has a 3 Amp filament.

Who told you the 5U4G is compatible with the 5Z4 / 5Z4P?
 
6

6A3sUMMER

Member
Joined 2016
I believe everything I read on the web:

1. Especially if I wrote it (No, I make mistakes; No, I have opinions)

2. Especially if it is a site that will sell you something; tubes, transformers, amps, etc.

I did not see anything at the link above that said "the 5U4 is compatible with the 5Z4"
It merely 'mentioned' the 5U4 at the page that discussed 5Z4 tubes.
From there it linked to the Watford Valves site that sells 5U4 tubes.
Watford valves did Not say the 5U4 and 5Z4 are compatible.

Now I know there is a debate about whether or not you should delay B+ until the other tubes warm up.
The 2 common methods are a B+ Delay Relay, and Indirect Heated Rectifiers (i.e. 5Z4).
I will not argue whether delayed B+ is needed or not.

I use solid state rectifiers; They cause fairly immediate B+ (and are delayed slightly by the high count multi-element B+ filter parts).

But I design the rest of the amplifier circuitry so that the tubes are not stressed during warm up, and so the tubes are not stretched to their maximum spec limits during the warmed up, and the listening operation of the amp.
 
Last edited:
M

Mickocool

Member
Joined 2018
6A3sUMMER said:
I believe everything I read on the web:

1. Especially if I wrote it (No, I make mistakes; No, I have opinions)

2. Especially if it is a site that will sell you something; tubes, transformers, amps, etc.

I did not see anything at the link above that said "the 5U4 is compatible with the 5Z4"
It merely 'mentioned' the 5U4 at the page that discussed 5Z4 tubes.
From there it linked to the Watford Valves site that sells 5U4 tubes.
Watford valves did Not say the 5U4 and 5Z4 are compatible.

Now I know there is a debate about whether or not you should delay B+ until the other tubes warm up.
The 2 common methods are a B+ Delay Relay, and Indirect Heated Rectifiers (i.e. 5Z4).
I will not argue whether delayed B+ is needed or not.

I use solid state rectifiers; They cause fairly immediate B+ (and are delayed slightly by the high count multi-element B+ filter parts).

But I design the rest of the amplifier circuitry so that the tubes are not stressed during warm up, and so the tubes are not stretched to their maximum spec limits during the warmed up, and the listening operation of the amp.
Click to expand...

Is the 6v6/6v6g/6v6gt the same specs for 6p1 compatibility? Also you said 6l6 should be fine too right ?
 
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