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Gold Lion KT77 or Winged SED EL34 In SSE?

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cbutterworth

Member
Joined 2006
I just ordered some Gold Lion KT77, but am wondering if they will work.

B+ is 425 v loaded with KT88's pulling around 79 mA with 560 ohm cathod resistor.

So I begin modeling for EL34's in SECad (Glassware software) to estimate what cathode resistors I need. George uses 38 as the input voltage from the driver. With EL34, I can model everything fine and use a range of cathode resistances below 810 ohms and get zero positive grid voltages.

However, when I switch over to a KT77, I get excessive grid voltages to the extent that I need to drop the input voltage from the driver to around 33 v.

Of course all this is modeled by software, but I am wondering if I should change my order out to a true EL34 before it gets processed and shipped.

Thanks,
Charlie
 
kevinkr

kevinkr

Administrator
Joined 2004
kta-hifi.net
Paid Member
Something going on with your model, the KT77 is not that different in most ways from an EL34 and changes if required should be trivial.(Try asking for a model in the tube spice model sticky on the tube / valves forum and model in spice if you are able)

George should have the last word here, but I can't think of a single reason why the KT77 shouldn't work.
 
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