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drdna wrote:

So, my thought was that below 35 hz, there are many ways of thinking about amplification. Some might say SS amplification is helpful due to power demands of horn loaded 18" woofers. To use 6C33 might be a trade off but I do not know if overall it would be a benefit. From your experience, what is your thinking?

I would withhold my comments about it. However, you need to find out how much power and how much gain you need for you subs and your room. Borrow for someone any 6C33C and measure how far the 6C33C will be from class A2 at a level of max tolerable bass in your room.

drdna wrote:

It is a good idea to use the 6C33 for the woofer and subwoofer, but I worry that it would compromise the LF sound due to the demands of the subwoofer.

I do not see why subwoofer’s demands would compromise anything. We are taking about SET. It sucks constant current. If you are taking about loading demand then it is more complicated subject.  The keys in the decision to go for separate DSET for upperbass in not LF but HF. You need to know if the inductance of your upperbass returns anything into MF channel.  THAT was why I separated my upperbass and MF – I have written about it as it was the issue with my Fane 8M driver.  If you have the same problem than a simple solution would be to add just one more 2A3 with own OPT and driver from the same driver and driver from it the upperbass. In your case it would be even simpler. You have two stages on two halves with 6SN7 with too much gain. You might convert your amp into two stages 6SN7-2A3 and make each halve of 6SN7 to drive own 2A3: one upper bass and another MF. All that you need to worry if your PS would care another 60mA. In this setting you might load MF 2A3 with respect of best harmonics and the upperbass 2A3 with respect of most power (if it were necessary)

Anyhow, that all properly shell be in a different thread…

 The caT

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