I got some $1 output tubes that may work in this amplifier, so I had to try them out. There have been the usual delays due to "trying to keep my day job" activities and Sherri being away for much of the year, but the most recent delays are for two good reasons. It can be used if needed, and it is needed in pentode mode. Provision for global negative feedback is available.
I may produce a 6AQ5 version of this board if there are enough requests for it.Īs usual the board can be wired for triode, UL and pentode mode. The 6AQ5 is cheaper but produces slightly less power, and a slightly different sound. I chose the 6BQ5 / EL84 tube mostly because that is what was requested in the email that I received. One of the main requirements was for a stable design that didn't require any component tweaking to make it work. Every amp was evaluated for performance, simplicity, and most important, the ability to be assembled by builders of varying skill levels and work the first time. Some used the 6AQ5 tube, and some used the 6BQ5 / EL84 tube. Why have I done "yet another version of this common design?" I have breadboarded countless variations of small P-P amps. All three of these amps look like descendants of the Williamson to me. The truth is that it is about as simple of a P-P amp that I could come up with that yielded good performance. I Have already been informed that it bears a resemblance to SY's "red light district" amplifier, and Morgan Jones "Bevois Valley" amp.
#Tubbler labs Pc
I plan to take this design through to a production PC board, but it will not be ready until the 2nd quarter of 2009. It is currently going through my rigorous testing, and I have been using it for several experiments. The Small one has progressed to the "third prototype PC board" stage. The “Small” one, now called the SPP, and the "Big" one, now called the Universal PP driver. There are two P-P designs currently under development. For now future products must wait until the current new project (SPP) pays for itself. This forced the delay in the launch of the Tubelab SPP. When the economy started to slow down last year, sales of PC boards dwindled too. There is no budget for transformers or other costly parts. The budget for new projects is very limited so except for small parts all development projects in 2009 will come from my "junk box" which fortunately is well stocked. So for now, Tubelab is operating with a fraction of my time, none of Sherri's, and limited funds. Unfortunately no job is totally secure, and the expenses associated with Sherri's mom have forced a careful optimization of Tubelab's expenses. I am usually at work 10 to 12 hours a day lately doing my best to stay employed.
The communications industry has been hit hard by the economic downturn with hundreds of layoffs in the plant where I work. We should be returning to Florida in a week or so.
Sherri and I are staying at her mothers house for a short while.
I am building this page on the road somewhere in western Pennsylvania. There are also one or two more new boards planned for 2019……stay tuned!
#Tubbler labs full
There is already a new board in stock, but full web site ready build instructions are not ready yet: The progress of the new TSE-II can be followed on the Tubelab forum here: I already have a prototype board running, but I expect that it will be 4 to 6 weeks before the design is fully tested and new boards are in stock. More filtering has been added to the filament regulator circuit to handle 2A3’s without issue. The new board will be slightly bigger to handle 300B tubes, and provide more space around the heat sinks. In the process a list of requests from prior builders was collected and is being accommodated. The TSE is being redesigned to use a different regulator chip. The filament regulator chip used in the TSE is no longer made….in fact Sharp is no longer alive, it is now part of the Foxconn empire. Several hundred amps have been built, but all good things must come to an end…….only to be replaced by BETTER things. It has been an old faithful for 14 years. There are ZERO in stock, and none will be reordered. The TSE board shown in this web site is NO LONGER available.
0 kommentar(er)
