Mark Durham Vajra JTM45

In memory of Mark

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colossal
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Mark Durham Vajra JTM45

Post by colossal »

Interesting to see this amp come up with some commentary on Mark and 18Watt.

https://www.youtube.com/watch?v=JcqVhnNh3Qk
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Daviedawg
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Re: Mark Durham Vajra JTM45

Post by Daviedawg »

Thanks for the link. I will watch that later today.

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ViperDoc
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Re: Mark Durham Vajra JTM45

Post by ViperDoc »

Some nice playing out of a very nice sounding amp. I noticed the "Vajra" 18-watt build in the documents here. The 500KL pot looks like a trimmer for the other "300K", noting the parallel 750K. What does "P/P to SE" mean? "Push/Pull to ....?" Single ended?
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colossal
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Re: Mark Durham Vajra JTM45

Post by colossal »

ViperDoc wrote:
Tue 08/24/21 3:14 pm
Some nice playing out of a very nice sounding amp. I noticed the "Vajra" 18-watt build in the documents here. The 500KL pot looks like a trimmer for the other "300K", noting the parallel 750K. What does "P/P to SE" mean? "Push/Pull to ....?" Single ended?
Yes. If you look at the P/P to SE pot, it grounds the signal on the inverting side as the pot is rotated to SE, running the amp in pseudo-single ended mode. This unbalances the phase inverter too.
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