I've got a question about building a Hamptone tube mic pre as per his TapeOp article from years ago. I'm unsure about the output transformer I need. It uses a totem pole output stage and calls for a 4:1 step down output transformer. I think the Jensen JT-10K-61-1M is recommended. But I'm a) cheap and b) curious about other options.
Do I have to have a center tap for this application? And if so, could somebody give me a simple explanation of why? The schematic shows one, but I was wondering if I could just wire up something like the Carnhill 10k:600R offerings from AML. Or Edcor XSMs or similar. It would save me bundles of money over the Jensens, which are really pricey.
The schematic for the circuit is available here:
https://web.archive.org/web/20030408091534/http://www.hamptone.com/figure1.htm
More info:
https://web.archive.org/web/20030407232915/http://www.hamptone.com/mic-pre_kit.htm
Thanks
Do I have to have a center tap for this application? And if so, could somebody give me a simple explanation of why? The schematic shows one, but I was wondering if I could just wire up something like the Carnhill 10k:600R offerings from AML. Or Edcor XSMs or similar. It would save me bundles of money over the Jensens, which are really pricey.
The schematic for the circuit is available here:
https://web.archive.org/web/20030408091534/http://www.hamptone.com/figure1.htm
More info:
https://web.archive.org/web/20030407232915/http://www.hamptone.com/mic-pre_kit.htm
Thanks