Analog Metric sells Shuguang tubes and has a PDF on its download page containing datasheets for a number of their tubes. Here is a link to the download page (go to the very bottom for the Shuguang datasheet document):
Analog Metric - DIY Audio Kit Developer
and here is a direct link to the Shuguang tube datasheet PDF:
http://analogmetric.com/download/Shuguang Beijing Vacuum Tube Datasheet Analog Metric Limited.pdf
I hope this helps.
Chinese Tubes
Ray,
Wow, thanks a lot! It looks like that might be a good place to order stuff too. Do you have any experience doing so - import fees and shipping costs? Do you know how they “match” tubes in sets?
My guess is that Carvin used those EL34As in my son’s guitar amplifier. Except for the “PM EL34/6CA7” inked and "46 mA 11/51" ratings paper tag markings, they look identical to the attached photo.
Ray,
Wow, thanks a lot! It looks like that might be a good place to order stuff too. Do you have any experience doing so - import fees and shipping costs? Do you know how they “match” tubes in sets?
My guess is that Carvin used those EL34As in my son’s guitar amplifier. Except for the “PM EL34/6CA7” inked and "46 mA 11/51" ratings paper tag markings, they look identical to the attached photo.
Attachments
I've never ordered anything from them myself so I can't offer any advice there. One thing I have noticed is that they sell a lot of clones of other designs. While this might be benign for products that were discontinued years ago, there are a few that are in direct competition with current production products (an example is the Transcendent Sound "Grounded Grid" preamplifier). So each of us has to let our conscience guide us when deciding whether to buy those particular products. Of course, this doesn't apply to parts; just kits.
QQ03/12 Tetrode SPICE Model
Try this one, should be close enough...
Try this one, should be close enough...
Code:
*
* Generic pentode model: QQ03_12_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Sat Mar 07 19:15:37 2015
* Plate
* | Screen Grid
* | | Control Grid
* | | | Cathode
* | | | |
.SUBCKT QQ03_12_AN A G2 G1 K
BGG GG 0 V=V(G1,K)+1
BM1 M1 0 V=(0.10806033*(URAMP(V(G2,K))+1e-10))**-1.4768137
BM2 M2 0 V=(0.50389449*(URAMP(V(GG)+URAMP(V(G2,K))/4.5910051)))**2.9768137
BP P 0 V=0.0012268646*(URAMP(V(GG)+URAMP(V(G2,K))/9.1110445))**1.5
BIK IK 0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.0011989613*V(M1)*V(M2)
BIG IG 0 V=0.0006134323*URAMP(V(G1,K))**1.5*(URAMP(V(G1,K))/(URAMP(V(A,K))+URAMP(V(G1,K)))*1.2+0.4)
BIK2 IK2 0 V=V(IK,IG)*(1-0.4*(EXP(-URAMP(V(A,K))/URAMP(V(G2,K))*15)-EXP(-15)))
BIG2T IG2T 0 V=V(IK2)*(0.87112107*(1-URAMP(V(A,K))/(URAMP(V(A,K))+10))**1.5+0.12887893)
BIK3 IK3 0 V=V(IK2)*(URAMP(V(A,K))+22300)/(URAMP(V(G2,K))+22300)
BIK4 IK4 0 V=V(IK3)-URAMP(V(IK3)-(0.00082086248*(URAMP(V(A,K))+URAMP(URAMP(V(G2,K))-URAMP(V(A,K))))**1.5))
BIP IP 0 V=URAMP(V(IK4,IG2T)-URAMP(V(IK4,IG2T)-(0.00082086248*URAMP(V(A,K))**1.5)))
BIAK A K I=V(IP)+1e-10*V(A,K)
BIG2 G2 K I=URAMP(V(IK4,IP))
BIGK G1 K I=V(IG)
* CAPS
CGA G1 A 0.1p
CGK G1 K 3.7p
C12 G1 G2 2.5p
CAK A K 2.6p
.ENDS
That's a great way to verify the model, please provide the bias voltage and the Ra-a of the OPT so I run the sim for the output stage only.
Jaz,
I have triode characteristics with halves in parallel, but the visibility is really very bad, sorry. If can help ...
Attachments
Thanks, I built the model with a similar parallelled triode curves and simply divided the current by 2 to arrive at the value of a single triode. Like all models, it probably still requires some adjustments to make it work properly in a circuit.
Ra-a is 10 k, but the bias voltage I can't find just now.
However, the cathode current of one halve is 17,5 mA.
Ah, I thought you said you have a lot of data on the amplifier, i.e., you can compare the simulation with the actual measurement results, oh well...