Tube Recommendations For Marshall Origin 50H

[Inspector #20]

Been thinking about installing the Genelex Russian Made B759 Gold Lion preamp tubes that have worked so well for me in DSL40C's when high gain is desired. Keep in mind the 'Gold-Pin' B759 is Russian made, but the 'Standard Pin' B759 is a 'Shuguang' tube, made in P.R.C.

I did find this recommendation from Tube Amp Doctor:


Product information "Tubeset for Marshall Origin 50H and 20H"
Tubeset for Marshall Origin 50H and 20H

In the first position (V1), this tube set features our RT010 7025 TAD HIGHGRADE Premium Selected which is outstanding because of its high gain but low microphony, powerful middles and a round, rich overtone sound.

For the second position (V2), we recommend our RT011 7025 S Premium Selected -Mullard style-. It delivers a rich, harmonically complex tone and mid-range warmth that is just outstanding compared to any other currently manufactured tube today; great warm and clean tones and creamy overdrive.

In the following third position we use our special Phase Driver selected RT001-BPD 12AX7A-C TAD, BALANCED PHASE DRIVER Selection.

For the power tubes, we only use a matched pair of our sensational new high-gain RT162 EL34B-STR TAD Premium Matched. These very dynamic tubes are an authentic remake of the British Mullard EL34. Their clear and harmonic open top end allows for great clean tone and at the same time, the TAD EL34B-STR offer incredibly powerful mids and equally powerful bass.
The golden control grid and especially large cooling grids guarantee maximum stability and reliability. Consequently, this EL34 provides a maximum of gain and dynamic response.

Tubeset includes:

1x RT010 - Input tube V1
7025 TAD HIGHGRADE Premium Selected

1x RT011 - V2
7025 S Premium Selected -Mullard style- TAD-Tubes

1x RT001-BPD - V3
12AX7A-C TAD, BALANCED PHASE DRIVER Selection

1x RT162 - Power Tubes
EL34B-STR TAD Premium Matched PAIR

Bias has to be set up in the Origin 50H (65mV across test point CN32)
The Origin 20 is cathode biased: no need to adjust!


However, I do not think that TAD is shooting for increased gain levels, like I am. In the DSL40C, i've had great results with lower-gain JJ 5751's in V2 and V3, with the Gold Lion B759 in V1 and V4, but because the Origin seems so different, I wanted to ask the more knowledgeable folks on TTR what their opinons of the B759 in V1, V2 & V3 would be in this amp specifically.

Thanks...

 

[gball]

Only recommendation I have is to play the heck out of it for a while with the stock tubes to find out if you think there is anything that needs a remedy. The amp was designed for those tubes and theoretically optimized for them. If after playing for a while you feel a need to adjust anything then start tube rolling - I know with my Mesas and the Riveras I have owned nothing has ever been an improvement over the stock tubes.

 

[Inspector #20]

Only recommendation I have is to play the heck out of it for a while with the stock tubes to find out if you think there is anything that needs a remedy. The amp was designed for those tubes and theoretically optimized for them. If after playing for a while you feel a need to adjust anything then start tube rolling - I know with my Mesas and the Riveras I have owned nothing has ever been an improvement over the stock tubes.

Good point...

I have used Gold Lion B759's before - in my 2203/1990 stage rig - as they are just a 12AX7 in terms of pin assignments and functionality, but they dramatically increase gain and I feel as though more gain is needed..

 

[Inspector #20]

Update on the tubes I'm currently using in the Origin 50:

Currently, I'm using a TAD 7025-WA in V1, and Genelex B759 Gold Lions in V2 and V3.

At first, I was using a Genelex Gold Lion B759 in V1, but I encountered a slight microphonic issue and promptly switched that tube out.

My honest feeling is the only thing I notice when changing tubes is gain production, with the B759 Gold Lions having the highest gain production of any 12AX7 style tube tested and 5751 having the lowest gain production.

I seem to recall that certain tubes are to be avoided in the cathode follower position???