"Superfly" - submini tube version of Doug H's Firefly

[MetalUpYerEye]

Sorry I just realized... The xfmr that that link takes you to is a Hammond 125a... I was looking at the Fender P-T1750a at www.tubesandmore.com... It wont let me link to it though... It just keeps taking me to the Hammond 125a page when I link to the Fender one...

Should work though... Primary impedance is 22,800 ohms, secondary is 8 ohms and 3.5w audio output. Pretty close to the Hammond 125a... Whatcha think?

[MetalUpYerEye]

I hate to keep bumping this... Should I start my own thread on my build?

[frequencycentral]

You have been tuning your trim pot to feed the 6111WA with 185 volts right?

Yeah, I've found that the SMPS likes to work best at 185v. I've tuned a few up to work at higher voltage, but always end up tweaking back down to 185v.

Sorry I just realized... The xfmr that that link takes you to is a Hammond 125a... I was looking at the Fender P-T1750a at www.tubesandmore.com... It wont let me link to it though... It just keeps taking me to the Hammond 125a page when I link to the Fender one...

Should work though... Primary impedance is 22,800 ohms, secondary is 8 ohms and 3.5w audio output. Pretty close to the Hammond 125a... Whatcha think?

Yeah sounds good.

I hate to keep bumping this... Should I start my own thread on my build?

Up to you, the benefit of keeping it all in one thread is the reference it builds up for future builders.

[MetalUpYerEye]

I'll stick with this thread for my questions. I'm also going to keep records of the parts list, etc. that I use so we can put them on the wiki. Any special source for 6112 and 6111wa tubes in the US? Is there a big difference between 6111 and 6111wa tubes?

[frequencycentral]

6111 are rated at 150v, 6111WA are rated at 300v. In practice, 6111 will work just fine - tougher than buffalo hide. I'm in the UK, but buy my tubes from US ebay sellers.

[frequencycentral]

Another Superfly. This one's got a 'Brake' pot instead of a master volume. I replaced R8 (470R) with a 500R linear panel mounted pot. The internal trimmer is still there - used to set the maximum voltage. The 'Brake' pot then varies the B+ between 110v and 190v.

[Poste]

Where do you get those protection "bars" from?

[MetalUpYerEye]

They look like cabinet handles that you might find at Home Depot, Lowe's or Ikea...

FC, where you do buy your sub mini tubes from? I've been searching ebay a bit and they seem a bit pricey ($12-15 each)... I'm also interested in your Pentaboost project and read that those tubes are supposedly cheap in cost as well but I can't find them for less than $15 each... 

[frequencycentral]

Ebay for tubes. Just keep looking for bargains, they do come up from time to time - but I'll probably outbid you.    I've built up quite a stockpile buying bargains.

[Perrow]

Ebay for tubes. Just keep looking for bargains, they do come up from time to time - but I'll probably outbid you.    I've built up quite a stockpile buying bargains.

Not every time :-) I've got ten 6112 coming my way. I think I got them for about 34 dollars and 10 dollars in shipping.

Edit: damn you auto correct.

[Perrow]

Not every time :-) I've got ten 6112 coming my way. I think I got them for about 34 dollars and 10 dollars in shipping.

Speak of the devil, mailman just handed me the box :-)

[frequencycentral]

Not every time :-) I've got ten 6112 coming my way. I think I got them for about 34 dollars and 10 dollars in shipping.

Speak of the devil, mailman just handed me the box :-)

Damn your mailman, my auto re-direct must not be working.

[Perrow]

Damn your mailman, my auto re-direct must not be working.

You'll damn him ever more when I've now opened the box, rechecked my confirmation mail and now sit here with not ten but twenty 6112 tubes bought for $29 and $14 in shipping (so $43 total). My memory is clouded by my current bronchitis (and a "slightly" bored four year old son, also with bronchitis).

They're a mix of full leads and trimmed (probably pulls) but I'm sure most of them will prove to work. Now if I could only find the time to actually finish this amp (hoping my Chinese 6111 substitutes will a) work and b) be good enough to make some nice sounds).

[MetalUpYerEye]

Damn your mailman, my auto re-direct must not be working.

You'll damn him ever more when I've now opened the box, rechecked my confirmation mail and now sit here with not ten but twenty 6112 tubes bought for $29 and $14 in shipping

Thats the thing... I don't need 20 of the darn things.. I'd be happy with two but have really been looking for 4 or 5 of them for like $15-20... Seems all I can find is one tube for $12 shipped or two for $15. Beyond that it goes to 10's, 20's, 100's... 

I guess i'll keep an eye out... What about the tube you used for your Pentaboost?

[frequencycentral]

Hey wait! Perrow has more than he needs, MetalUpYerEye doesn't have any...........you guys should trade! Any spares I'll take if the price is right.

5672 from Ebay too, I bought a bulk amount years ago, I don't wanna sell any but I'll trade for 6111/6112.

[Perrow]

I might wait to trade any of these and buy up on some 6111's and sell packages for this amp :-)

[MetalUpYerEye]

If you could make a 6111 and 6112 pack available i'd be in. But you'd need to sell the ones with full pins or test the ones without...

Even if you sold them for $12 a pair shipped you could still make your money back before you've sold half of them. That is, if you can get 20 or so 6111's for ~$45.

I'd be interested in a deal with the IRF740, BC547C and the two diodes as well... I rarely build and I don't have a stocked bench so finding one-off parts can be a pain in the ass for me... Basically the only stuff I have 'stocked' are resistors, some caps and 2n3904, 2n5088, j201's... As well as some jacks, pots, switches, etc. randomness.. 

[Perrow]

Even if you sold them for $12 a pair shipped you could still make your money back before you've sold half of them.

A statement that shows you haven't shipped anything out of (or even inside) Sweden

But it might hold at $14 or $15 (said without checking actual shipping costs but postage in Sweden is expensive, and out of Sweden even more so).

I'll see what I can do for buying 6111s or even 6021s, only found them quite a bit more expensive.

[MetalUpYerEye]

True, I have never shipped to or from Sweden...

I often forget that many of the people on this board are from other countries... Back to ebay to hunt for tubes I guess... If you guys will let me win an auction... 

[MetalUpYerEye]

FC - Sorry to be a bother... Looking at tubes on ebay I noticed that you originally said that a 6111 or 6021 could be used in place of the 7327... 6021 seems to be a bit cheaper... Any particular reason you've chosen to use 6111's in your builds over 6021?

Also... I just placed an order with Small Bear for some other stuff... But couldn't find any of the IRF740, uf4004 or the inductor available... I think I searched Tayda and they didn't have them either...