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Got the original service manual if you want it. PM me

Alan has confirmed that these amps are from David's early work. Alan has also repaired some of these amps many years ago and traced the circuit at that time. I sent the pic to Anna Eva and David's son Luke after the restoration and they were kind enough to acknowledge the mail. Does anyone...

Tim de Paravacini also spent some of  his early years in SA. He was very well known for his transformer design expertise as well as an amp designer.

Small reel to reel tape recorder. 60's vintage, probably made by Philips or Pye

Dan has been performing overseas and is now well accepted as a true blues artist. He gets better every year. Glad he still comes home so that we can attend his concerts.

Great news for us old ballies. "Radio killed the video star...." What happened to the DAB+ broadcasts that were on air for the last two years?

WOW indeed. Never knew this stuff existed!

Little confused. (Quite normal for me). Is bit rot referring to the loss of the integrity of a file stored on disk, or the inability to transfer data to disk accurately. I've just transferred my cd collection to disk. Used forward error correction in transfer and raid drives for back up and...

Please keep the pics flowing during the process Charles

Brings back memories. Pretoria to Durban over Easter with LM radio as a companion. On shortwave fading in and out.

Forgot to mention, the amps use 6SN7's and 807's

I got hold of a couple of monoblocks some ten years ago with info plates on them. Pis below. They were in bad shape and with a circuit diagram courtesy of Alan Hobkirk, rebuilt them. I listened to them for a while and then they go lost in the cupboard till now. With David Manley's recent...

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Don't have enough toys to do noise measurements, hence the exercise. [/URL][/URL]

You are correct ludo the pinch off voltage spread is within spec and your Idss curves are included below. The curves closest to your spec sheet are the originals but you can certainly see the differences. Also included is the transfer admittance curve with the measured sample data, 4 for the...

Oops, it's the saturation current Idss that determines the grading. Mantech publish the Toshiba spec on their site and at R44.00 per jfet, one would certainly expect the devices to be genuine.

The 2SK170 has not been manufactured for some years now so it would be interesting to see if Mantech can supply a few jfets. There are three different grades in the market, GR, BL and V (green, blue and violet). The grading refers to a range of saturation voltages (Vdss), GR seems to be more...

I guess the reason for this post is get an idea of how many of you folks have ended up with fake devices and how did you figure out that they were fake

Thanks for the feedback. The one on the right is the genuine article.

Most of us bottleheads progress through various cycles of valve euphoria and end up applying our minds, budgets and families to the need to understand the essence of the pleasure that valve amplified music gives us. Whether we do so by collecting old equipment, repairing or restoring it...